asp.net กดที่ select ของ Gridview แล้วให้ข้อมูลไปขึ้นที่ textbox ทำไงค่ะ

Protected Sub GridView1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles GridView1.SelectedIndexChanged

        Textbox1.Text = GridView1.SelectedRow.Cells(1).Text.ToString
        Textbox2.Text = GridView1.SelectedRow.Cells(2).Text.ToString
        Textbox3.Text = GridView1.SelectedRow.Cells(3).Text.ToString
        Textbox4.Text = GridView1.SelectedRow.Cells(4).Text.ToString
End Sub

    <script type="text/javascript">

        var grdRowselected;
        //Start Spliter Controls
        $(document).ready(function () {
            $("#splitterContainer").splitter({ minAsize: 100, maxAsize: 800, splitVertical: true, A: $('#leftPane'), B: $('#rightPane'), slave: $("#rightSplitterContainer"), closeableto: 0 });
            //$("#rightSplitterContainer").splitter({ splitHorizontal: true, A: $('#rightTopPane'), B: $('#rightBottomPane'), closeableto: 100 });
        });

        function toggleRightBottomHeight() {
            $("#splitterContainer .splitbuttonH").trigger("mousedown"); //trigger the button
        }
        function toggleLeftWide() {
            $("#splitterContainer .splitbuttonV").trigger("mousedown"); //trigger the button
        }
        //End Spliter Controls

        $(".GridView tr:not([class=PagerStyle]):not(:first-child)").live('mouseover mouseleave', function (event) {
            if (event.type == 'mouseover') {
                $(this).addClass("highlightRow");
            } else {
                $(this).removeClass("highlightRow");
            }
        });
        //$(".GridView tr:has(td):not(:has(span))").live('click', function (e) {
        $(".GridView tr:not([class=PagerStyle]):not(:first-child)").live('click', function (e) {
            $(grdRowselected).removeClass("SelectedRowStyle");
            $(this).addClass("SelectedRowStyle");
            grdRowselected = this;
            $get('msthfGridViewSelectedRow').value = $(this).closest('tr')[0].sectionRowIndex;
        });

        $(".GridView tr:not([class=PagerStyle]):not(:first-child)").live('dblclick', function (e) {
            $(grdRowselected).removeClass("SelectedRowStyle");
            $(this).addClass("SelectedRowStyle");
            grdRowselected = this;
            $get('msthfGridViewSelectedRow').value = $(this).closest('tr')[0].sectionRowIndex;
            //var grdID = document.getElementsByClassName('GridView')[0].id;
            //var grdID = document.querySelector('.GridView').id;
            //document.querySelector('.GridView').id
            $get('msthfGridViewSelectedID').value = document.querySelector('.GridView').id;
            $get('mstbtnGridViewDoubleClick').click();
        });

// Patch fractional .x, .y form parameters for IE10.
     if (typeof (Sys) !== 'undefined' && Sys.Browser.agent === Sys.Browser.InternetExplorer && Sys.Browser.version === 10) {
         Sys.WebForms.PageRequestManager.getInstance()._onFormElementActive = function Sys$WebForms$PageRequestManager$_onFormElementActive(element, offsetX, offsetY) {
             if (element.disabled) { return; }
             this._activeElement = element;
             this._postBackSettings = this._getPostBackSettings(element, element.name);
             if (element.name) {
                 var tagName = element.tagName.toUpperCase();
                 if (tagName === 'INPUT') {
                     var type = element.type;
                     if (type === 'submit') {
                         this._additionalInput = encodeURIComponent(element.name) + '=' + encodeURIComponent(element.value);
                     }
                     else if (type === 'image') {
                         this._additionalInput = encodeURIComponent(element.name) + '.x=' + Math.floor(offsetX) + '&' + encodeURIComponent(element.name) + '.y=' + Math.floor(offsetY);
                     }
                 }
                 else if ((tagName === 'BUTTON') && (element.name.length !== 0) && (element.type === 'submit')) {
                     this._additionalInput = encodeURIComponent(element.name) + '=' + encodeURIComponent(element.value);
                 }
             }
         };
     }

    </script>