Monday, October 12, 2009

How To Export Data in a DataGrid on an ASP . NET WebForm to Microsoft Excel

  • Start Visual Studio .NET. On the File menu, point to New, and then click Project.
  • In the Project Types pane, click Visual Basic Projects. Under Templates, click ASP.NET Web Application. Name the application ExcelExport and then click OK.
    WebForm1 appears in Design view for you.
  • In Solution Explorer, right-click WebForm1.aspx and then click Rename. Change the name of the file to Bottom.aspx.
  • On the View menu, click HTML Source to add the following DataGrid between the < form > and < / form > tags:

    <asp:datagrid id="DataGrid1" runat="server" GridLines="Vertical" CellPadding="3" BackColor="White" BorderColor="#999999" BorderWidth="1px" BorderStyle="None" Width="100%" Height="100%" Font-Size="X-Small" Font-Names="Verdana"> <SelectedItemStyle Font-Bold="True" ForeColor="White" BackColor="#008A8C"></SelectedItemStyle> <AlternatingItemStyle BackColor="Gainsboro"></AlternatingItemStyle> <ItemStyle BorderWidth="2px" ForeColor="Black" BorderStyle="Solid" BorderColor="Black" BackColor="#EEEEEE"></ItemStyle> <HeaderStyle Font-Bold="True" HorizontalAlign="Center" BorderWidth="2px" ForeColor="White" BorderStyle="Solid" BorderColor="Black" BackColor="#000084"></HeaderStyle> <FooterStyle ForeColor="Black" BackColor="#CCCCCC"></FooterStyle> <PagerStyle HorizontalAlign="Center" ForeColor="Black" BackColor="#999999" Mode="NumericPages"></PagerStyle> </asp:datagrid>

  • On the View menu, click Design to return to design view.
    The DataGrid appears on the WebForm.
  • On the View menu, click Code to display the code behind the Web Form. Add the following code to the Page_Load event handler:

    Note You must change User ID <username> and password=<strong password> to the correct values before you run this code. Make sure that the user account has the correct permissions to perform this operation on the database.


    ' Create a connection and open it. Dim objConn As New System.Data.SqlClient.SqlConnection("User ID=<username>;Password=<strong password>;Initial Catalog=Northwind;Data Source=SQLServer;") objConn.Open() Dim strSQL As String Dim objDataset As New DataSet() Dim objAdapter As New System.Data.SqlClient.SqlDataAdapter() ' Get all the customers from the USA. strSQL = "Select * from customers where country='USA'" objAdapter.SelectCommand = New System.Data.SqlClient.SqlCommand(strSQL, objConn) ' Fill the dataset. objAdapter.Fill(objDataset) ' Create a new view. Dim oView As New DataView(objDataset.Tables(0)) ' Set up the data grid and bind the data. DataGrid1.DataSource = oView DataGrid1.DataBind() ' Verify if the page is to be displayed in Excel. If Request.QueryString("bExcel") = "1" Then ' Set the content type to Excel. Response.ContentType = "application/vnd.ms-excel" ' Remove the charset from the Content-Type header. Response.Charset = "" ' Turn off the view state. Me.EnableViewState = False
    Dim tw As New System.IO.StringWriter() Dim hw As New System.Web.UI.HtmlTextWriter(tw) ' Get the HTML for the control. DataGrid1.RenderControl(hw) ' Write the HTML back to the browser. Response.Write(tw.ToString()) ' End the response. Response.End()
    End If




  • NOTE: Replace SQLServer in the code with the name of your SQL Server. If you do not have access to a SQL Server that contains the Northwind sample database, modify the connection string to use the Microsoft Access 2002 sample Northwind database:

    provider=microsoft.jet.oledb.4.0; data source=C:\Program Files\Microsoft Office\Office10\Samples\Northwind.mdb

    If you select this method, modify the aforementioned code to use the OleDbClient namespace rather than the SqlClient namespace.

  • On the Project menu, click Add HTML Page. Name the page Top.htm and then click Open.
    Top.htm appears in Design view.
  • On the View menu, click HTML Source. Replace the contents of the HTML source window with the following code:

    <html> <script language="vbscript"> Sub Button1_onclick Select Case Select1.selectedIndex Case 0 ' Use Automation. Dim sHTML sHTML = window.parent.frames("bottom").document.forms(0).children("DataGrid1").outerhtml Dim oXL, oBook Set oXL = CreateObject("Excel.Application") Set oBook = oXL.Workbooks.Add oBook.HTMLProject.HTMLProjectItems("Sheet1").Text = sHTML oBook.HTMLProject.RefreshDocument oXL.Visible = true oXL.UserControl = true Case 1 ' Use MIME Type (In a New Window). window.open("bottom.aspx?bExcel=1") Case 2 ' Use MIME Type (In the Frame). window.parent.frames("bottom").navigate "bottom.aspx?bExcel=1" End Select End Sub </script> <body> Export to Excel Using: <SELECT id="Select1" size="1" name="Select1"> <OPTION value="0" selected>Automation</OPTION> <OPTION value="1">MIME Type (In a New Window)</OPTION> <OPTION value="2">MIME Type (In the Frame)</OPTION> </SELECT> <INPUT id="Button1" type="button" value="Go!" name="Button1"> </body> </html>

  • On the Project menu, click Add HTML Page. Name the page Frameset.htm and then click Open.
    Frameset.htm opens in Design view.
  • On the View menu, click HTML Source. Replace the contents of the HTML source window with the following code:

    <html> <frameset rows="10%,90%"> <frame noresize="0" scrolling="no" name="top" src="top.htm"> <frame noresize="0" scrolling="yes" name="bottom" src="bottom.aspx"> </frameset> </html>

  • In Solution Explorer, right-click Frameset.htm and then click Set As Start Page.
  • On the Build menu, click Build Solution.
  • On the Debug menu, click Start Without Debugging to run the application.
    After the frameset opens in the Web browser, the DataGrid in the bottom frame displays the data from the Northwind database.
  • In the drop-down list, click Automation, and then click Go.
    The DataGrid contents are displayed outside the browser in the Microsoft Excel application window.
  • In the drop-down list, click MIME Type (In a New Window), and then click Go.
    The DataGrid contents are displayed in Excel hosted in a new Web browser window.
    NOTE: If you receive a prompt to open or save the Excel file, click Open.
  • In the drop-down list, click MIME Type (In the Frame) and then click Go.
    The DataGrid contents are displayed in the bottom frame of the frameset in Excel hosted in the Web browser.
    NOTE: If you receive a prompt to open or save the Excel file, click Open.

    enjoy……………………..

    • Posted by vishal swami at 10/12/2009 04:04:00 PM
    Labels: , ,

    Friday, October 9, 2009

    How to get the Column information for a Table using T-SQL

    in this sample I am getting the column information for a table called ‘Account’:

    SELECT     Columns.name AS ColumnName, ColumnTypes.name AS Type, Columns.prec AS Precision, Columns.scale AS Scale, 
                          Columns.isnullable AS IsNullable
    FROM         sys.sysobjects AS Tables INNER JOIN
                          sys.syscolumns AS Columns ON Columns.id = Tables.id INNER JOIN
                          sys.systypes AS ColumnTypes ON Columns.xtype = ColumnTypes.xtype
    WHERE     (Tables.type = 'U') AND (Tables.name = N'Account')
    ORDER BY ColumnName

    Posted by vishal swami at 10/09/2009 11:59:00 AM
    Labels: ,

    Why do ASP.NET control events fire more than once?

    I’ve always wondered about this and here is the answer:

    ASP.NET controls recreates their hierarchy (at a minimum) twice during a single request to the server:

    1. First when the control is being restored to a it's previous state.
    2. Second when all the required modifications are applied.
    Posted by vishal swami at 10/09/2009 11:55:00 AM
    Labels: , ,
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