How to code Modal popup in asp.net

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C#

ASP.NET

SQL

I have a popup modal using asp.net and it does appear but when i click btnOkay instead of navigating to

OnClick="btnOkay_Click"

it do nothing

Here is my code

<div>
        <asp:scriptmanager id="ScriptManager1" runat="server">
</asp:scriptmanager>



<cc1:modalpopupextender id="ModalPopupExtender1"  runat="server" 
	cancelcontrolid="btnCancel" okcontrolid="btnOkay" 
	targetcontrolid="btnVote" popupcontrolid="Panel1" 
	popupdraghandlecontrolid="PopupHeader" drag="true" 
	backgroundcssclass="ModalPopupBG">
</cc1:modalpopupextender>

        <asp:Panel ID="Panel1" Style="display: none;" runat="server">
            <div class="HellowWorldPopup">
                <div class="PopupHeader" id="PopupHeader">
                    <h3>Read before you vote!</h3>
                </div>
                <div class="PopupBody">
                    <p>Are you sure you wanna procede</p>
                </div>

                <div class="Controls">
                      
                    
                    <asp:Button ID="btnOkay" OnClick="btnOkay_Click" runat="server" Text="Agree" />
                    <asp:Button ID="btnCancel" runat="server" Text="Decline" />

                </div>

            </div>
        </asp:Panel>
    </div>

Here is my

OnClick="btnOkay_Click"

code

protected void btnOkay_Click(object sender, EventArgs e)
   {

       string sql = "SELECT * FROM STUDENT WHERE Student_Number = '" + Session["name"].ToString() + "'";
       SqlConnection conn = new SqlConnection(ConnString);
       SqlCommand cmd = new SqlCommand(sql, conn);
       if (conn.State == ConnectionState.Closed)
       {
           conn.Open();
       }
       DataTable dt = new DataTable();

       SqlDataAdapter adapter = new SqlDataAdapter(cmd);

       adapter.Fill(dt);

       if (dt.Rows[0]["Student_Nationality"].ToString() == "South African" && dt.Rows[0]["Student_Accomodation"].ToString() == "On Campus")
       {
           Response.Redirect("~/VoteGeneral.aspx");
       }

       else if (dt.Rows[0]["Student_Nationality"].ToString() == "South African" && dt.Rows[0]["Student_Accomodation"].ToString() == "Off Campus")
       {
           Response.Redirect("~/VoteOppidani.aspx");
       }
       else if (dt.Rows[0]["Student_Nationality"].ToString() == "Non South Afircan" && dt.Rows[0]["Student_Accomodation"].ToString() == "On Campus")
       {
           Response.Redirect("~/VoteInternational.aspx");
       }
       else if (dt.Rows[0]["Student_Nationality"].ToString() == "Non South Afircan" && dt.Rows[0]["Student_Accomodation"].ToString() == "Off Campus")
       {
           Response.Redirect("~/Vote.aspx");
       }
       else
       {
           Response.Write("Sorry You can not vote");
       }
   }