Check All Checkbox In GridView To Bulk Edit Update ASP.NET

This example explains how to use Check All Checkbox In GridView To Bulk Edit Or Update in ASP.NET with C# and VB.NET. I have put a checkBox in header Template of gridview which on checking will check all rows in gridview using server side code to implement CheckAll CheckBox functionality.

Html SOURCE OF GRIDVIEW

---

<asp:GridView ID="GridView1" runat="server" 
              DataSourceID="SqlDataSource1" 
              AutoGenerateColumns="false" 
              CellPadding="2" ForeColor="#333333" 
              GridLines="Both" 
              DataKeyNames="ID" 
              OnRowDataBound="GridView1_RowDataBound">
<Columns>
<asp:TemplateField HeaderText="CheckAll">
<HeaderTemplate>
<asp:CheckBox ID="chkSelectAll" runat="server" 
              AutoPostBack="true" 
              OnCheckedChanged="chkSelectAll_CheckedChanged"/>
</HeaderTemplate>
<ItemTemplate>
<asp:CheckBox ID="chkSelect" runat="server" 
              AutoPostBack="true" 
              OnCheckedChanged="chkSelect_CheckedChanged"/>
</ItemTemplate>
</asp:TemplateField>

<asp:BoundField DataField="ID" HeaderText="ID" 
                SortExpression="ID"/>
<asp:TemplateField HeaderText="Name" SortExpression="Name">
<ItemTemplate>
<asp:TextBox ID="txtName" runat="server" 
             Text='<%# Bind("Name") %>' ForeColor="Blue" 
             BorderStyle="none" BorderWidth="0px" 
             ReadOnly="true" >
</asp:TextBox>
</ItemTemplate>
</asp:TemplateField>

<asp:TemplateField HeaderText="Location" SortExpression
="Location">
<ItemTemplate>
<asp:TextBox ID="txtLocation" runat="server" 
             Text='<%# Bind("Location") %>' 
             ForeColor="Blue" BorderStyle="none" 
             ReadOnly="true">
</asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>

<asp:SqlDataSource ID="SqlDataSource1" runat="server" 
ConnectionString="<%$ ConnectionStrings:ConnectionString %>"
SelectCommand="SELECT [ID], [Name], [Location] FROM [Details]" 
DeleteCommand="DELETE FROM Details WHERE (ID = @ID)" 
UpdateCommand="UPDATE [Details] SET [Name] = @Name, 
               [Location] = @Location WHERE [ID] = @ID">
<DeleteParameters>
<asp:Parameter Name="ID" />
</DeleteParameters>

<UpdateParameters>
<asp:Parameter Name="Name" />
<asp:Parameter Name="Location" />
<asp:Parameter Name="ID" />
</UpdateParameters>
</asp:SqlDataSource>

<asp:Button ID="btnUpdate" runat="server" 
            OnClick="btnUpdate_Click" Text="Update" />
<asp:Button ID="btnDelete" runat="server" 
            OnClick="btnDelete_Click" 
            Text="Delete" />

C# CODE

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protected void chkSelectAll_CheckedChanged
                               (object sender, EventArgs e)
{
 CheckBox chkAll = 
    (CheckBox)GridView1.HeaderRow.FindControl("chkSelectAll");
 if (chkAll.Checked == true)
 {
   foreach (GridViewRow gvRow in GridView1.Rows)
   {
    CheckBox chkSel = 
         (CheckBox)gvRow.FindControl("chkSelect");
    chkSel.Checked = true;
    TextBox txtname = (TextBox)gvRow.FindControl("txtName");
    TextBox txtlocation = (TextBox)gvRow.FindControl("txtLocation");
    txtname.ReadOnly = false;
    txtlocation.ReadOnly = false;
    txtname.ForeColor = System.Drawing.Color.Black;
    txtlocation.ForeColor = System.Drawing.Color.Black;
   }
 }
 else
 {
  foreach (GridViewRow gvRow in GridView1.Rows)
  {
   CheckBox chkSel = (CheckBox)gvRow.FindControl("chkSelect");
   chkSel.Checked = false;
   TextBox txtname = (TextBox)gvRow.FindControl("txtName");
   TextBox txtlocation = (TextBox)gvRow.FindControl("txtLocation");
   txtname.ReadOnly = true;
   txtlocation.ReadOnly = true;
   txtname.ForeColor = System.Drawing.Color.Blue;
   txtlocation.ForeColor = System.Drawing.Color.Blue;
   }
  }
}

VB.NET

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Protected Sub chkSelectAll_CheckedChanged(ByVal sender As Object, ByVal e As EventArgs)
    Dim chkAll As CheckBox = DirectCast(GridView1.HeaderRow.FindControl("chkSelectAll"), CheckBox)
    If chkAll.Checked = True Then
        For Each gvRow As GridViewRow In GridView1.Rows
            Dim chkSel As CheckBox = DirectCast(gvRow.FindControl("chkSelect"), CheckBox)
            chkSel.Checked = True
            Dim txtname As TextBox = DirectCast(gvRow.FindControl("txtName"), TextBox)
            Dim txtlocation As TextBox = DirectCast(gvRow.FindControl("txtLocation"), TextBox)
            txtname.[ReadOnly] = False
            txtlocation.[ReadOnly] = False
            txtname.ForeColor = System.Drawing.Color.Black
            txtlocation.ForeColor = System.Drawing.Color.Black
        Next
    Else
        For Each gvRow As GridViewRow In GridView1.Rows
            Dim chkSel As CheckBox = DirectCast(gvRow.FindControl("chkSelect"), CheckBox)
            chkSel.Checked = False
            Dim txtname As TextBox = DirectCast(gvRow.FindControl("txtName"), TextBox)
            Dim txtlocation As TextBox = DirectCast(gvRow.FindControl("txtLocation"), TextBox)
            txtname.[ReadOnly] = True
            txtlocation.[ReadOnly] = True
            txtname.ForeColor = System.Drawing.Color.Blue
            txtlocation.ForeColor = System.Drawing.Color.Blue
        Next
    End If
End Sub

Hope this helps.