Image to Byte Array and Byte Array to Image Converter

Recently I was looking for a class which could convert a System.Drawing.Image to byte[] array and vice versa.
After a lot of searching on Google, I realised that it would be faster for me to write this class and also share it.

The class which I wrote is called ImageConverter.cs. The class has two methods.

First method: Convert Image to byte[] array:


public byte[] imageToByteArray(System.Drawing.Image imageIn)
{
 MemoryStream ms = new MemoryStream();
 imageIn.Save(ms,System.Drawing.Imaging.ImageFormat.Gif);
 return  ms.ToArray();
}

This method uses the System.Drawing.Image.Save method to save the image to a memorystream. The memorystream can then be used to return a byte array using the ToArray() method in the MemoryStream class.

Second method: Convert byte[] array to Image:


public Image byteArrayToImage(byte[] byteArrayIn)
{
     MemoryStream ms = new MemoryStream(byteArrayIn);
     Image returnImage = Image.FromStream(ms);
     return returnImage;
}

This method uses the Image.FromStream method in the Image class to create a method from a memorystream which has been created using a byte array. The image thus created is returned in this method.

The way I happen to use this method was to transport an image to a web service, by converting it to a byte array and vice-versa.

Hope this class is useful to all.

Asp.Net MVC Framework

Dear all here i am giving link of one of my favorite ASP.Net MVC Famework Book...... Hope so this will helps you.

Click here to download

  

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Suppress Subreport

How to suppress a subreport of main report in Crystal Report.

Suppress a subreport if there are no record found.

I am not sure but you can't really suppress a subreport in runtime.


But you can follows following details and get required result.


My DataTable has an extra column that will tell me whether or not I have to suppress the subreport. Then while in CR designer, right click on the subreport you want to supress and select FORMAT. Check the suppress checkbox and then click on the formula button (X2). Within your script check for the column value:


if {YourDataTable.YourColumn} = "Value" then
true
else
false

Another way you can suppress your detail section of Crystal Report from code behind page of form where you display your report.

Private Sub Report_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Try
       
            Me.WindowState = FormWindowState.Maximized

      
                Dim crt As New CrystalReport1

                // ds is DataSet which is not empty means it has record


                crt.SetDataSource(ds)
                If (ds.Table(2).Rows.Count <= 0) Then

                    crt.ReportDefinition.Sections("DetailSection3").SectionFormat.EnableSuppress = True
                 
                End If      
                CrystalReportViewer1.ReportSource = crt
                CrystalReportViewer1.Show()        
   Catch ex As Exception
            Throw ex
        End Try
      
    End Sub
End Class


Hopefully these information will help you.

Thanks and regard
Sumedh Borkar

DataTable - Adding, Modifying, Deleting, Filtering, Sorting rows

 

 In this article, I am going to explain how to Add, Modify, Delete, Sort, Filter rows of the DataTable.

Introduction

DataTable is a central object in the ADO.NET library. If you are working with ADO.NET - accessing data from database, you can not escape from DataTable. Other objects that use DataTable are DataSet and DataView. In this tutorials, I will explain how to work with DataTable. I have tried to cover most of the frequently used activity in the DataTable, I hope you will like it

Creating a DataTable

To create a DataTable, you need to use System.Data namespace, generally when you create a new class or page, it is included by default by the Visual Studio. Lets write following code to create a DataTable object. Here, I have pased a string as the DataTable name while creating DataTable object.

// instantiate DataTable 

DataTable dTable = new DataTable("Dynamically_Generated");

Creating Columns in the DataTable

To create column in the DataTable, you need to use DataColumn object. Instantiate the DataColumn object and pass column name and its data type as parameter. Then call add method of DataTable column and pass the DataColumn object as parameter.

Specifying AutoIncrement column in the DataTable

To specify a column as AutoIncrement (naturally it should be an integer type of field only), you need to set some properties of the column like AutoIncrement, AutoIncrementSeed. See the code below, here I am setting the first column "AutoID" as autoincrement field. Whenever a new row will be added its value will automatically increase by 1 as I am specified AutoIncrementSeed value as 1.

// specify it as auto increment field
auto.AutoIncrement = true;
auto.AutoIncrementSeed = 1;
auto.ReadOnly = true;

If you want a particular column to be a unique column ie. you don't want duplicate records into that column, then set its Unique property to true like below.

auto.Unique = true;

Specifying Primary Key column in the DataTable

To set the primary key column in the DataTable, you need to create arrays of column and store column you want as primary key for the DataTable and set its PrimaryKey property to the column arrays. See the code below.

// create primary key on this field 

DataColumn[] pK = new DataColumn[1];
pK[0] = auto;
dTable.PrimaryKey = pK;

Till now we have created the DataTable, now lets populate the DataTable with some data.

Populating data into DataTable

There are two ways to populate DataTable.

Using DataRow object

Look at the code below, I have created a DataRow object above the loop and I am assiging its value to the dTable.NewRow() inside the loop. After specifying columns value, I am adding that row to the DataTable using dTable.Rows.Add method.

// populate the DataTable using DataRow objectDataRow row = null;
for (int i = 0; i < 5; i++)
{
     row = dTable.NewRow();
     row["AutoID"] = i + 1;
     row["Name"] = i + " - Ram";
     row["Address"] = "Ram Nagar, India - " + i;
     dTable.Rows.Add(row);}

Instead of using the column name, you can use ColumnIndex too, however it is not suggested as you might want to add a column in the mid of the table then you will need to change your code wherever you have specified the index of the column. Same applies while reading or writing values into Database column.

Asiging the value of column using Arrays

In following code, I have specified the values of every column as the array separated by comma (,) in the Add method of the dTable.Rows.

// manually adding rows using array of values 

dTable.Rows.Add(6, "Manual Data - 1", "Manual Address - 1, USA");
dTable.Rows.Add(7, "Manual Data - 2", "Manual Address - 2, USA");

Modifying data into DataTable

Modifying Row Data

To edit the data of the row, sets its column value using row index or by specifying the column name. In below example, I am updating the 3rd row of the DataTable as I have specified the row index as 2 (dTable.Rows[2]).

// modify certain values into the DataTabledTable.Rows[2]["AutoID"] = 20;
dTable.Rows[2]["Name"] = "Modified";
dTable.Rows[2]["Address"] = "Modified Address";
dTable.AcceptChanges();

Deleting Row

To delete a row into DataTable, call the rows.Delete() method followed by AcceptChanges() method. AcceptChanges() method commits all the changes made by you to the DataTable. Here Row[1] is the index of the row, in this case 2nd row will be deleted as in collection (here rows collection) count start from 0.

// Delete row 

dTable.Rows[1].Delete();
dTable.AcceptChanges();

Filtering data from DataTable

To filter records from the DataTable, use Select method and pass necessary filter expression. In below code, the 1st line will simply filter all rows whose AutoID value is greater than 5. The 2nd line of the code filters the DataTable whose AutoID value is greater than 5 after sorting it.

DataRow[] rows = dTable.Select(" AutoID > 5");
DataRow[] rows1 = dTable.Select(" AutoID > 5", "AuotID ASC");

Note that Select method of the DataTable returns the array of rows that matche the filter expression. If you want to loop through all the filtered rows, you can use foreach loop as shown below. In this code, I am adding all the filtered rows into another DataTable.

foreach (DataRow thisRow in rows)
{
     // add values into the datatable
     dTable1.Rows.Add(thisRow.ItemArray);}

Working with Aggregate functions 
We can use almost all aggregate functions with DataTable, however the syntax is bit different than standard SQL.
Suppose we need to get the maximum value of a particular column, we can get it in the following way.

DataRow[] rows22 = dTable.Select("AutoID = max(AutoID)");
string str = "MaxAutoID: " + rows22[0]["AutoID"].ToString();

To get the sum of a particular column, we can use Compute method of the DataTable. Compute method of the DataTable takes two argument. The first argument is the expression to compute and second is the filter to limit the rows that evaluate in the expression. If we don't want any filteration (if we need only the sum of the AutoID column for all rows), we can leave the second parameter as blank ("").

object objSum = dTable.Compute("sum(AutoID)", "AutoID > 7");
string sum = "Sum: " + objSum.ToString();
// To get sum of AutoID for all rows of the DataTable
object objSum = dTable.Compute("sum(AutoID)", "");

Sorting data of DataTable

Oops !. There is no direct way of sorting DataTable rows like filtering (Select method to filter DataRows).
There are two ways you can do this.

Using DataView

See the code below. I have created a DataView object by passing my DataTable as parameter, so my DataView will have all the data of the DataTable. Now, simply call the Sort method of the DataView and pass the sort expression. Your DataView object have sorted records now, You can either directly specify the Source of the Data controls object like GridView, DataList to bind the data or if you need to loop through its data you can use ForEach loop as below.

// Sorting DataTableDataView dataView = new DataView(dTable);
dataView.Sort = " AutoID DESC, Name DESC";
foreach (DataRowView view in dataView)
{

Response.Write(view["Address"].ToString());
}

Using DataTable.Select() method

Yes, you can sort all the rows using Select method too provided you have not specified any filter expression. If you will specify the filter expression, ofcourse your rows will be sorted but filter will also be applied. A small drawback of this way of sorting is that it will return array of DataRows as descibed earlier so if you are planning to bind it to the Data controls like GridView or DataList you will have for form a DataTable by looping through because directly binding arrays of rows to the Data controls will not give desired results.

DataRow[] rows = dTable.Select("", "AutoID DESC");

// create columns for the DataTable
DataColumn auto = new DataColumn("AutoID", typeof(System.Int32));
dTable.Columns.Add(auto);
// create another column
DataColumn name = new DataColumn("Name", typeof(string));
dTable.Columns.Add(name);
// create one more column
DataColumn address = new DataColumn("Address", typeof(string));
dTable.Columns.Add(address);

Hope this article will be useful. If you have any question, comments or
suggestions, please respond to this article. Thank you very much for
reading it and Happy DataTable 


Best Regards
Sumedh Borkar

.

Exporting Datagridview data into HTML page in Window Application using VB.Net

Here i am showing how to Exporting Datagridview data into HTML page in Window Application using VB.Net.

Follows following procedure as

Create Database by name HMS.mdb in MS-Access

Now add new table with name “Services” and add field as follows

Now your table Services is successfully Created. Add few records in this table like as

Now, we create Windows Application using VB.Net language for exporting datagridview data into a HTML page.

Design Form like as follows

Add following code in Form1.vb

'Add namespace

Imports System.Data.OleDb

'Global Declaration of variable as follows

Public cmd As OleDbCommand

Public da As OleDbDataAdapter

Private ds As DataSet = New DataSet()

Public con As OleDbConnection

Now add following code on page load event of this form Form1 i.e in Form1.vb as follows

'Form Load and display it containts

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

        Dim bRetVal As Boolean

        Dim sSql As String

        sSql = "select Channel_Service_ID,Channel_Service,Duration_Of_Service,Charge_For_Service,Service_Notes from Services;"

        Try

            bRetVal = getconnection()

            If bRetVal Then

                cmd = New OleDbCommand(sSql, con)

                da = New OleDbDataAdapter(cmd)

                da.Fill(ds, "tblServices")

                If (ds.Tables(0).Rows.Count > 0) Then

                    DataGridView1.DataSource = ds.Tables("tblServices")

                    Dim columnCount As Integer = ds.Tables(0).Columns.Count

                    Dim gridViewWidth As Integer = DataGridView1.Width

                    Dim i As Integer

                    For i = 0 To DataGridView1.Columns.Count

                        Dim ColumnWidth As Integer = gridViewWidth / columnCount

                        DataGridView1.Columns(i).Width = ColumnWidth

                    Next

                End If

            Else

                MessageBox.Show("Error in establishing connection ")

            End If

        Catch ex As Exception

            MessageBox.Show("There is problem is occurred… ")

        Finally

            con.Close()

        End Try

    End Sub

For above code there is needed connection with database, this is done by getconnection() method. For this add following code in Form1.vb

'getconnection method which is connected with database. This open connection

Function getconnection() As Boolean

        Dim bRetVal As Boolean

        Dim conStr As String

        con = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0; Data Source=" + Application.StartupPath + "\\Database\\HMS.mdb")

        Try

            con.Open()

            'MessageBox.Show("Establishing connection....");

            bRetVal = True

        Catch ex As Exception

            bRetVal = False

        Finally

        End Try

        Return bRetVal

    End Function

Now we add the code for exporting datagridview data into HTML page on button click event in Form1.vb as

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        Dim i As Integer

        Dim strIcode, strDescri, strCat, nQty As String

        Dim dCP, dSRP, dTCP, dTSRP As String

        Dim strFName As String = "C:\Sumedh\CMS Files\Services Details.html"

        Dim sHTML As String

        If DataGridView1.RowCount = 0 Then Exit Sub

        sHTML = "<html><head><title>Services Details Report</title></head>"

        sHTML = sHTML & "<body><center><br>"

        sHTML = sHTML + "<font size=5><b>Hospiatal Services</b></font><br>"

        sHTML = sHTML + "<font size=3>Date: " + System.DateTime.Now.Date + "<br><br>"

        sHTML = sHTML + "<table border=1 cellpadding=0 cellspacing=0>"

        sHTML = sHTML + "<tr><td><b>Channel_Service_ID</td><td><b>Channel_Service</td><td><b>Charge_For_Service</td><td><b>Duration_Of_Service</td>" + "<td><b>Service_Notes</td></tr>"

        For i = 0 To DataGridView1.RowCount - 1

            strIcode = DataGridView1.Item("Channel_Service_ID", i).Value

            strDescri = DataGridView1.Item("Channel_Service", i).Value

            strCat = DataGridView1.Item("Charge_For_Service", i).Value

            nQty = DataGridView1.Item("Duration_Of_Service", i).Value

            dCP = DataGridView1.Item("Service_Notes", i).Value

            sHTML = sHTML + "<tr><td>" + strIcode + "</td><td>" + strDescri + "</td><td>" + strCat + "</td>" + "<td>" + nQty + "</td><td>" + dCP + "</td></tr>"

        Next

        sHTML = sHTML & "</table></body></html>"

        If FileIO.FileSystem.DirectoryExists("C:\") Then

            SaveToHtml(sHTML, strFName)

            Process.Start(strFName)

        Else

            MsgBox("Drive C does not exist. Please do make drive C available.", MsgBoxStyle.Information)

        End If

        '// StopProcess()

    End Sub

Function SaveToHtml(ByVal strHTMLCodes As String, ByVal strFullPath As String) As Boolean

        Dim objReader As IO.StreamWriter

        If FileIO.FileSystem.DirectoryExists("C:\Services\Files") = False Then

            FileIO.FileSystem.CreateDirectory("C:\ Services \Files")

        End If

        Try

            objReader = New IO.StreamWriter(strFullPath)

            objReader.Write(strHTMLCodes)

            objReader.Close()

            Return True

        Catch ex As Exception

            MsgBox(ex.Message, MsgBoxStyle.Information)

            Return False

        End Try

    End Function

Save the entire application and run it. Check out the output result.

Open PDF file in Asp.net using Vb.net on button click event

This example used the asp.net with vb.net coding.

Here i am upload the PDF file path which is already stored on server side hard drive and this file path store in string variable sPath and now i was click the one button from Asp.net page then the particular PDF is open.

Code is below:
Placed following code  in button click event....

Dim client As New System.Net.WebClient()
Dim buffer As [Byte]() = client.DownloadData(sPath)

If buffer IsNot Nothing Then
Response.ContentType = "application/pdf"
Response.AddHeader("content-length", buffer.Length.ToString())
Response.BinaryWrite(buffer)
End If

How to retrieve image in gridview from the sql table (which is store as path in the table ) in Asp.net

You use an ImageField to display an image stored on the server’s hard drive. You can’t use

an ImageField to display images stored in a database table.

Following code shows how you can use the ImageField when creating a simple photo gallery

Using an ImageField with the GridView control.

Code For Above Diagram and check example code:

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<script runat="server">

  protected void frmPhoto_ItemInserting(object sender, FormViewInsertEventArgs e)
  {
        // Get the FileUpload control
        FileUpload upPhoto = (FileUpload)frmPhoto.FindControl("upPhoto");
        srcImages.InsertParameters["FileName"].DefaultValue = upPhoto.FileName;        

        string savePath = MapPath("~/Photos/" + upPhoto.FileName);
        // Save contents to file system
        upPhoto.SaveAs(savePath);
    }

    protected void frmPhoto_PageIndexChanging(object sender, FormViewPageEventArgs e)
    {

    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Show ImageField</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
  
    <asp:GridView
        id="grdImages"
        DataSourceID="srcImages"
        AutoGenerateColumns="false"
        ShowHeader="false"
        Runat="server">
        <Columns>
        <asp:ImageField
            DataImageUrlField="FileName"
            DataImageUrlFormatString="~/Photos/{0}"
            DataAlternateTextField="AltText"
            ControlStyle-Width="200px" />
        </Columns>
    </asp:GridView>
  
    <asp:SqlDataSource
        id="srcImages"
        ConnectionString="<%$ ConnectionStrings:Photos %>"
        SelectCommand="SELECT FileName, AltText FROM Photos"
        InsertCommand="INSERT Photos (FileName, AltText)
            VALUES (@FileName, @AltText)"
        Runat="server">
        <InsertParameters>
            <asp:Parameter Name="FileName" />
        </InsertParameters>
    </asp:SqlDataSource>  
          
    <hr />
    <asp:FormView
        id="frmPhoto"
        DefaultMode="Insert"
        DataSourceID="srcImages"
        OnItemInserting="frmPhoto_ItemInserting"
        Runat="server" onpageindexchanging="frmPhoto_PageIndexChanging">
        <InsertItemTemplate>
        <h1>Add Photo</h1>
        <asp:Label
            id="lblPhoto"
            Text="Photo:"
            AssociatedControlID="upPhoto"
            Runat="server" />
        <br />
        <asp:FileUpload
            id="upPhoto"            Runat="server" />
        <br />
        <asp:Label
            id="lblAltText"
            Text="Alternate Text:"
            AssociatedControlID="txtAltText"
            Runat="server" />
        <br />
        <asp:TextBox
            id="txtAltText"
            Text='<%# Bind("AltText") %>'
            Columns="50"
            Runat="server" />
        <br />
        <asp:Button
            id="btnInsert"
            Text="Add New Photo"
            CommandName="Insert"
            Runat="server" />          
        </InsertItemTemplate>
    </asp:FormView>
  
    </div>
    </form>
</body>
</html>
-----------------------------------------------------------------------------------

The GridView in above example contains an ImageField that looks like this:
<asp:ImageField
DataImageUrlField=”FileName”
DataImageUrlFormatString=”~/Photos/{0}”
DataAlternateTextField=”AltText”
ControlStyle-Width=”200px” />

The DataImageUrlField property contains the name of a field from the data source that
represents the path to an image on the server hard drive. The DataImageUrlFormatString
enables you to format this path. Finally, the DataAlternateTextField enables you to
specify the value of the alt attribute used by the <img> tag.


An ImageField supports the following properties:


. AlternateText—Enables you to specify fixed alternate text.
. DataAlternateTextField—Enables you to specify a field that represents the
alternate text.
. DataAlternateTextFormatString—Enables you to format the alternate text.
. DataImageUrlField—Enables you to specify a field that represents the image path.
. DataImageUrlFormatString—Enables you to format the image path.
. NullImageUrl—Enables you to specify an alternate image when the
DataImageUrlField is Nothing (null).