GridView "Select all” in Header

Sometimes it would be nice to have a “select all” feature for your grid check boxes. 

This can be easily accomplished using the header template of the grid view.

ASP.net code

<asp:GridView ID="gvTagEndorsementTypes" 

runat="server" AutoGenerateColumns="false" >

<Columns>                   

<asp:TemplateField HeaderText="Select">

<HeaderTemplate>

<asp:LinkButton ID="lbSelectEndorsements" 

OnClick="ToggleEndorsements_Click" runat="server"> Select 

</asp:LinkButton>

</HeaderTemplate>

<ItemTemplate >

<asp:CheckBox ID="cbSelect" runat="server"/>

</ItemTemplate>

</asp:TemplateField>

...

C# code

protected void ToggleEndorsements_Click(object sender, EventArgs e)

{

foreach (GridViewRow erow in gvTagEndorsementTypes.Rows)

{

CheckBox echeckbox = (CheckBox)erow.FindControl("cbSelect");

//see if the checkbox is checked.             

if (echeckbox.Checked)

{ echeckbox.Checked = false; }

else { echeckbox.Checked = true; }

}

}