I have repeater control and iframe in same update panel.
In repeater control, Link buttons are placed. On Click event of that link button, I want to update my Iframe. I am updating Iframe By javascript code.
But The code is not working.
 
Here is the designer Code:
 
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Always">
      <ContentTemplate>
            
        <div style="display: inline-block; border: solid 0px red; vertical-align: top;">
            <asp:Repeater ID="Repeater1" runat="server">
                <HeaderTemplate>
                    <table>
                </HeaderTemplate>
                <ItemTemplate>  
                    <tr> 
                        <td>                         
                             <asp:Button ID="LinkButton1" runat="server" class="btn btn-primary" Style="color: #fff; background-color: #337ab7; border-color: #2e6da4; display: inline-block; padding: 6px 8px; margin-bottom: 0; border: 1px solid transparent; border-radius: 4px;"
                              OnClick="LinkButton1_Click" Text='<%#Eval("Row#") %>' />                              
                        </td> 
                    </tr>
                </ItemTemplate> 
                <FooterTemplate>
                    </table>
                </FooterTemplate>
            </asp:Repeater>
            <asp:Label ID="lblfetchdata" runat="server"></asp:Label>
            <asp:Label ID="lblfetch" runat="server"></asp:Label>
        </div>
        <div style="display: inline-block; border: solid 0px green; vertical-align: top;">       
            <iframe id="ifrm_RentPrint" style="width: 334%; height: 900px; border: 0; margin-top: -24px"></iframe>         
        </div> 
     
      </ContentTemplate>
           
 </asp:UpdatePanel>
 
And Code Behind Is:
 
   protected void LinkButton1_Click(object sender, EventArgs e)
        {
            FilterResult();
            Button button = (Button)sender;
            string buttonId = button.Text;
            DataTable dt_OwnerFilter = new DataTable();
            dt_OwnerFilter = bl.BL_FetchOwnerInfo(bo);
            lblfetchdata.Text = string.Empty;
            int i = 0;
            foreach (DataRow dRow in dt_OwnerFilter.Rows)
            {
                butId = dt_OwnerFilter.Rows[i][0].ToString();
                if (buttonId == butId)
                {
                    if (dt_OwnerFilter.Rows.Count > 0)
                    {
                        string htmlcode = "";
                        htmlcode = "<a class='btn btn-primary' onclick='fnShow(" + dRow["PropertyDetailsId"] + ")'>  " + i + "</a>";
                        ClientScript.RegisterStartupScript(GetType(), "Javascript", "javascript:fnShow(" + dRow["PropertyDetailsId"] + "); ", true);
                        break;
                    }
                }
                else
                {
                    i = i + 1;
                }
            }
            if (dt_OwnerFilter.Rows.Count == 0)
            {
                lblfetch.Text = " Zero Results Found For Your Search...!!!.";
            }
        }