写的删除事件的代码如下，但点击删除按钮，却没有反应。当然，数据库里的数据也没有变。
恳请高手指点。
protected void GridView1_OnRowDeleteCommand(object sender, GridViewDeleteEventArgs e)
    {
        string id = GridView1.DataKeys[e.RowIndex].Values[0].ToString();
        strSql = "delete * from employees where emp_Id='" +id+ "'";
        try
        {
            SqlConnection conn = DB.createSqlconnection();
            if (conn.State.ToString() == "Closed")
            {
                conn.Open();
            }
            SqlCommand cmd = new SqlCommand(strSql, conn);
            if (cmd.ExecuteNonQuery() > 0)
            {
                cmd.Dispose();
                conn.Close();
                Response.Write("<script>alert('删除成功！')</script>");
            }
            else
            {
                Response.Write("<script>alert('删除失败！')</script>");

            }
            GridView1.EditIndex = -1;//返回没有编辑的状态
            this.Data_Bind("");

        }
        catch (Exception ex)
        {
            Response.Write("数据库错误，错误原因：" + ex.Message);
            Response.End();
        }
    }

用的是
if (!Page.IsPostBack)
{
   this.Data_Bind("");  
}
是不是这里有问题呢？