How to fire select row command in gridview on enter key press in asp.net c#

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C#

ASP.NET

Javascript

ASP.NET4

protected void gridproduct_RowCreated(object sender, GridViewRowEventArgs e)
   {
       if (e.Row.RowType == DataControlRowType.DataRow && (e.Row.RowState == DataControlRowState.Normal || e.Row.RowState == DataControlRowState.Alternate))
       {
           e.Row.TabIndex = -1;
           e.Row.Attributes["window.onload";] = string.Format("javascript:SelectRow(this, {0})";, 0);
           e.Row.Attributes["onclick"] = string.Format("javascript:SelectRow(this, {0});", e.Row.RowIndex);
           e.Row.Attributes["onkeydown"] = "javascript:return SelectSibling(event);";
           e.Row.Attributes["onselectstart";] = "javascript:return false;";

           e.Row.ToolTip = "Click to select row";
           e.Row.Cells[0].Width = Unit.Pixel(35);
           e.Row.Attributes.Add("onkeypress", "javascript:if (event.keyCode == 13) {  __doPostBack('" + gridproduct.UniqueID + "', 'Select$" + e.Row.RowIndex.ToString() + "'); return false; }");


        // e.Row.Attributes["onclick"] = this.Page.ClientScript.GetPostBackClientHyperlink(this.gridproduct, "Select$" + e.Row.RowIndex);
       }

   }

My java Script

<script type="text/javascript">
        var SelectedRow = null;
        var SelectedRowIndex = null;
        var UpperBound = null;
        var LowerBound = null;

        window.onload = function () {
            UpperBound = parseInt('<%= this.gridproduct.Rows.Count %>') - 1;
        LowerBound = 0;
        SelectedRowIndex = -1;
    }

    function SelectRow(CurrentRow, RowIndex) {
        if (SelectedRow == CurrentRow || RowIndex > UpperBound || RowIndex < LowerBound) return;

        if (SelectedRow != null) {
            SelectedRow.style.backgroundColor = SelectedRow.originalBackgroundColor;
            SelectedRow.style.color = SelectedRow.originalForeColor;
        }

        if (CurrentRow != null) {
            CurrentRow.originalBackgroundColor = CurrentRow.style.backgroundColor;
            CurrentRow.originalForeColor = CurrentRow.style.color;
            CurrentRow.style.backgroundColor = '#DCFC5C';
            CurrentRow.style.color = 'Black';
        }

        SelectedRow = CurrentRow;
        SelectedRowIndex = RowIndex;
        setTimeout("SelectedRow.focus();", 0);
    }

    function SelectSibling(e) {
        var e = e ? e : window.event;
        var KeyCode = e.which ? e.which : e.keyCode;

        if (KeyCode == 40)
            SelectRow(SelectedRow.nextSibling, SelectedRowIndex + 1);
        else if (KeyCode == 38)
            SelectRow(SelectedRow.previousSibling, SelectedRowIndex - 1);

        return false;
    }
    </script>

What I have tried:

I have tried these code its working fine for select row on up/down arrow but it's not firing row command on Enter key press and not select by default first row of gridview