Gridview模板列中textbox 按Ｅｎｔｅｒ切换到下一个textbox

Code
protected void gvGradeInput_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                if (e.Row.Cells[2].FindControl("txtPscj") is object)
                {
                    ((TextBox)e.Row.Cells[2].FindControl("txtPscj")).Attributes.Add("onkeydown", "if(event.keyCode==13) event.keyCode=9");
                }
                if(e.Row.Cells[2].FindControl("txtSycj") is object)
                {
                    ((TextBox)e.Row.Cells[2].FindControl("txtSycj")).Attributes.Add("onkeydown", "if(event.keyCode==13) event.keyCode=9");
                }
                 if(e.Row.Cells[2].FindControl("txtJmcj") is object)
                {
                    ((TextBox)e.Row.Cells[2].FindControl("txtJmcj")).Attributes.Add("onkeydown", "if(event.keyCode==13) event.keyCode=9");
                }
                 if(e.Row.Cells[2].FindControl("txtZcj") is object)
                {
                    ((TextBox)e.Row.Cells[2].FindControl("txtZcj")).Attributes.Add("onkeydown", "if(event.keyCode==13) event.keyCode=9");
                }

            }

        }