Add Template Field in yopur grid view under columns tag.
<asp:TemplateField HeaderText="Active/Inactive">
<EditItemTemplate>
<asp:CheckBox ID="CheckBox1" runat="server" />
</EditItemTemplate>
<ItemTemplate>
<asp:CheckBox ID="CheckBox1" runat="server" />
</ItemTemplate>
</asp:TemplateField>
//------- code for check box click
for (int i = 0; i < int.Parse(RegView.Rows.Count.ToString()); i++)
{
CheckBox myCheckBox = (CheckBox)RegView.Rows[i].FindControl("CheckBox1");
if (myCheckBox.Checked == true)
{
}
}