1. right click on your DataGrid -->Property Builder -->Columns --> Template Column --> Apply --> Ok.
2. Right click again --> EidtTemplate --> choose Column you add --> drag CheckBox control from Toolbox and drop it in ItemTemplate field and if you need CheckBox in edit mode put another CheckBox control in EditItemTemplate field --> End Template Editing.

Code on the button:

private void btn_Delete_Click(object sender, System.EventArgs e)
			for(int i=0;i<dg_EditProduct.Items.Count;i++)
				CheckBox chk = new CheckBox();
				chk = (CheckBox)dg_EditProduct.Items[i].FindControl("chk_Delete");
					DataTable myTable;
					int ID_Delete = Convert.ToInt32( myTable.Rows[i]["ProductID"]);

					Str_Conn = ConfigurationSettings.AppSettings["Fashion"];
					MyConn = new SqlConnection(Str_Conn);
					//Command to delete Product
//					SqlCommand cmd_DeleteProduct = new SqlCommand("dbo.DeleteProduct",MyConn);
					SqlCommand cmd_DeleteProduct = new SqlCommand("DeleteProduct",MyConn);
					cmd_DeleteProduct.CommandType = CommandType.StoredProcedure;
					SqlParameter ProductID_Delete = cmd_DeleteProduct.Parameters.Add("@ProductID",SqlDbType.Int);
					ProductID_Delete.Value = ID_Delete ;

					dg_EditProduct.DataSource = myTable;
			BindData(); // it is the function you use to bind data to datagrid on page load
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