Deleting Rows From DataGrid

Last Modified On : 30-Sep-2006


 <!-- The following form displays rows in datagrid along with a checkbox in each row.
 Rows can be deleted by turning the checkbox on and then clicking on Delte button --!>


  <%@ Page Language="VB" %>
  <%@ import Namespace="System.Data,system.Data.SqlClient" %>

  <script runat="server">

   Dim ConnectionString As String  = "uid=sa;database=pubs"

   Sub Page_Load(Sender As Object, E As EventArgs)

      If Not Page.IsPostBack Then
        BindData()
      End If

   End Sub

   Private Sub btnDelete_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)

    Dim i As Integer = 0
    Dim cb As CheckBox
    Dim dgi As DataGridItem
    Dim id As Integer

    dim con as new SQlConnection( connectionstring)
    con.open()

    dim cmd as new SQLCommand("delete from sometable where id = @id",con)
    dim p as new SQLParameter("@id",sqldbtype.int)
    cmd.parameters.add(p)


    For Each dgi In DataGrid1.Items
      cb = CType(dgi.findcontrol("chkdelete"), CheckBox)

      If cb.Checked Then
        id = CType( DataGrid1.DataKeys(i), Integer)  ' get primary key
        p.value = uid
        try
          cmd.ExecuteNonQuery()
        catch ex as Exception
          response.write( ex.message)
       end try

     End If
     i += 1
    Next

    con.close()

    binddata()

   End Sub

   Sub BindData()

      Dim myConnection As New SqlConnection(ConnectionString)
      Dim myCommand As New SqlDataAdapter("select  * from sometable", myConnection)

      Dim ds As New DataSet()
      myCommand.Fill(ds)

      DataGrid1.DataSource = ds
      DataGrid1.DataBind()

   End Sub

  </script>

 <html>
 <body>

 <form runat="server">
      <asp:datagrid id="DataGrid1" runat="server"  DataKeyField="id">
      <Columns>
      <asp:templateColumn>
      <headertemplate>Delete</headertemplate>
      <itemtemplate>
      <asp:checkbox id=chkdelete  runat="server"></asp:checkbox>
      </itemtemplate>
      </asp:templateColumn>
      </Columns>
      </asp:datagrid>
      <p/>
      <asp:button id="btndelete" runat="server" text="Delete" onclick="btndelete_click"/>
      </form>
    </body>
 </html>
 
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