How to find all the checked checkboxes in an asp.net gridview

I have seen this question a gazillion times on the forums – Finding checked checkboxes in an ASP.NET GridView. Here’s how to do so. The CheckBox in our example is in a TemplateField as shown below:

<asp:TemplateField>   
    <ItemTemplate >      
       <asp:CheckBox id="CheckBox1" runat="server" />  
     </ItemTemplate> 
</asp:TemplateField>

In order to find the checked checkboxes on a button click, use this simple code

C#

    protected void Button1_Click(object sender, EventArgs e)
    {    
        foreach (GridViewRow gvr in GridView1.Rows)
        {
            CheckBox chkBox = (CheckBox)gvr.FindControl("CheckBox1");
            if (chkBox != null && chkBox.Checked)
            {

            }
        }
    }

VB.NET

Protected Sub Button1_Click(ByVal sender As Object, _
ByVal e As EventArgs)
    For Each gvr As GridViewRow In GridView1.Rows
        Dim chkBox As CheckBox = _
           CType(gvr.FindControl("CheckBox1"), CheckBox)
        If chkBox IsNot Nothing AndAlso chkBox.Checked Then
        ' Do Something
        End If
    Next gvr
End Sub