怎样删除GridView中的数据？

自己写删除事件,干嘛要用他自带的

protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
try
{
DBOp dbop = new DBOp(Request.PhysicalApplicationPath);
string sql = "delete from Main_pricute where lujing='" + this.GridView1.DataKeys[e.RowIndex].Value + "'";
int i = dbop.ExcuteCommand(sql);
//if (i != 0)
//{
FileInfo f = new FileInfo(Server.MapPath("../../"+GridView1.DataKeys[e.RowIndex]["lujing"].ToString()));
f.Delete();
Response.Write("<script>alert('删除成功！');</script>");
this.Bindinfo();
//}
}
catch (Exception ex)
{
throw ex;
}
}