Gridview is not refreshing after Clicking on the Dynamically created Link button in Header Template

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C#

ASP.NET

Greetings,

I have created a Dynamic Header in Gridview, in that a link button will be created dynamically in Row_Created Event. On Clicking on this dynamic link button a javascript function is called to raise a ASP button Click event. On Clicking on this Link Button data is saving in database and also populating in DataSet. After gridview DataBind the record count is also showing correctly, but the data is not displaying in Gridview. But after page refresh or clicking on any other button in the page all the records are displaying.

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="frmOverview.aspx.cs" Inherits="frmOverview"
    Theme="RioTinto" EnableEventValidation="false" EnableViewState="true" %>

Please help me in this.
Please find the below code

public override void VerifyRenderingInServerForm(Control control)
    {

        // Confirms that an HtmlForm control is rendered for the specified ASP.NET server control at run time.
    }
   

protected void gvOverview_RowCreated(object sender, GridViewRowEventArgs e)
    {


 LinkButton lnkSave = new LinkButton();
                lnkSave.Text = "Save";
                lnkSave.ForeColor = System.Drawing.Color.White;
                lnkSave.Font.Underline = true;
                //lnkSave.Click += lnkSave_Click;
                lnkSave.OnClientClick = "ClickEven()";

GridViewRow HeaaderGridRow2 = new GridViewRow(1, 0, DataControlRowType.Header, DataControlRowState.Insert);
                HeaaderGridRow2.CssClass = "HeaderFreez";
                HeaaderGridRow2.BackColor = System.Drawing.ColorTranslator.FromHtml("#005b92");

                gvOverview.Controls[0].Controls.AddAt(1, HeaaderGridRow2);
}

in ASPX Page.

<asp:Button ID="btnSave" runat="server" Text="Save&" OnClick="btnSave_Click" Style="display: none;" />


function ClickEven() {
      document.getElementById("btnSave").click();
  }

IT's urgent...