While I Clicking Button In Asp.Net C# Its Goes To Design Page, Not Goes For Code Behid Page Please Tell Me Any Solution For This?

<%@ Page Title="" Language="C#" MasterPageFile="~/PHR.master"AutoEventWireup="true" CodeFile="RoleBasedDataAccess.aspx.cs" Inherits="RoleBasedDataAccess" %>

<%@ Register assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" tagprefix="cc1" %>

<script  runat="server">

    protected void F_Encrypt_Click(object sender, EventArgs e)
    {

    }
</script>


<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
    
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
   
    <p>
    </p>
   
    <cc1:TabContainer ID="TabContainer1"  runat="server" ActiveTabIndex="0" 
        Height="393px" ScrollBars="Horizontal" Width="977px" 
         öndatabinding="Page_Load" style="margin-right: 201px">
        <cc1:TabPanel   runat="server" ID="TabPanel1">
<HeaderTemplate>Role Based Data Access</HeaderTemplate>
  <contenttemplate>  
    <table class="style4">
        <tr>
            <td class="style10"> </td>
            <td class="style11">
                <asp:Label 
            ID="Label7" runat="server" Text="select Patient ID">              
                <asp:DropDownList ID="Dddl_pid" runat="server" 
                DataSourceID="SqlDataSource1" DataTextField="Pat_Id" DataValueField="Pat_Id">
                <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
                ConnectionString="<%$ ConnectionStrings:heartConnectionString5 %>" 
                SelectCommand="SELECT [Pat_Id] FROM [patient]">
                <asp:Label ID="Label4" runat="server" 
                Text="If you need to take census need not to select patient ID" 
            Font-Names="Colonna MT" ForeColor="#6600FF"></td>
            <td class="style9">Welcome! <asp:Label ID="lbhname" runat="server"> Administrator</td>
          </tr><tr>
               <td class="style5"><br /></td>
               <td class="style13">
                   <asp:Label ID="Label3" runat="server" Text="Select Access"> 
                   <asp:DropDownList ID="DDL_access"  runat="server">              
                        <asp:ListItem>---Select Access---         
                        <asp:ListItem>AD
                        <asp:ListItem>DT
                        <asp:ListItem>PT
                        <asp:ListItem>RS
                        <asp:ListItem>CD
                        <asp:ListItem>FM
                        <asp:ListItem>EM
  <asp:DropDownList ID="ddl_disease" runat="server" 
                        DataSourceID="SqlDataSource2" DataTextField="Pat_Disease" 
                        DataValueField="Pat_Disease"><asp:SqlDataSource ID="SqlDataSource2" runat="server" 
                        ConnectionString="<%$ ConnectionStrings:heartConnectionString6 %>" 
                        SelectCommand="SELECT distinct [Pat_Disease] FROM [patient]"><br /><asp:Label ID="Label6" runat="server" Text="Select File for Encrypt"> <asp:FileUpload ID="FileEncrypt" runat="server" /><br /><br /><asp:Button 
            ID="F_Create" runat="server" OnClick="F_Create_Click" Text="File Create" /> <asp:Button 
            ID="F_View" runat="server" OnClick="F_View_Click" Text="View" /><asp:Button 
            ID="F_Encrypt" runat="server" OnClick="F_Encrypt_Click" Text="Encryption" /> <asp:Button 
            ID="F_Decrypt" runat="server" Text="Decryption" /></td><td> </td><td class="style5"><br /><br /></td><td> </td></tr><tr><td class="style5"> </td><td class="style6" colspan="2"><asp:Panel ID="Panel1" runat="server" ScrollBars="Vertical" Width="818px"><asp:GridView ID="GridView1" runat="server" Width="817px"></td></tr></table></contenttemplate>
        
        <cc1:TabPanel ID="TabPanel2"  runat="server" HeaderText="Fine Grained Data Access"><HeaderTemplate>Fine Grained Data Access</HeaderTemplate><contenttemplate><asp:Panel 
            ID="Panel2" runat="server" Height="359px"><asp:Button ID="View_Finegrained" 
            runat="server" onclick="View_Finegrained_Click" Text="View" /><asp:GridView 
            ID="GridView2" runat="server"></contenttemplate>
        
        <cc1:TabPanel ID="TabPanel3"  runat="server" HeaderText="Break Glass Data Access"><contenttemplate><asp:Label 
                ID="Label8" runat="server" Text="Select Patient ID">   <asp:DropDownList 
                ID="DDL_PAT_ID" runat="server"><br /><br />      <asp:Button 
                ID="Break_glass" runat="server" Height="54px" onclick="Break_glass_Click" 
                Text="SEND TO EMERGENCY DEPARTMENT" Width="307px" /></contenttemplate>