How to work with Page.ClientScript.GetPostBackClientHyperlink in C#

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C#3.5

Hi Geeks,

I've a gridview with selected columns and rows. The row consists of Textbox for every column in a row. I need to select a row in order to get the current rowindex which I've done using below code.

protected void gvtotqty_onrowdatabound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        e.Row.Attributes["onclick"] = Page.ClientScript.GetPostBackClientHyperlink(gvtotqty, "Select$" + e.Row.RowIndex);
        e.Row.ToolTip = "Click to select this row.";
    }
}

protected void gvtotqty_onselectedindexchanged(object sender, EventArgs e)
{
    foreach (GridViewRow row in gvtotqty.Rows)
    {
        if (row.RowIndex == gvtotqty.SelectedIndex)
        {
            Session["rowindex"]=row.RowIndex;
            row.BackColor = ColorTranslator.FromHtml("#A1DCF2");
            row.ToolTip = string.Empty;
        }
        else
        {
            row.BackColor = ColorTranslator.FromHtml("#FFFFFF");
            row.ToolTip = "Click to select this row.";
        }
    }
}

Everything is working fine where I get my rowindex when debugged but I am not able to type anything in Textbox as it is getting refreshed. I know that

Page.ClientScript.GetPostBackClientHyperlink

calls PostBackEvent. By using this method, how can I type the values in Textboxes?