Editing on Same Page Asp.net

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ASP.NET

I am trying to insertion the records of user and editing their record on the same page . If my query string contains the userid and action text fetch the user records populate the textbox control and change the button text to update.

On button click check the button text if it is update fetch the textboxes texts and fire updation. But the problem is when i update the records in text box and click the button it is fetching the old records instead of the new entered updated record form the textboxes.

In My Index.aspx file

<lable>UserName</lable> <asp:TextBox runat="server" ID="usernamebox"  CssClass="form-control"/>
 <lable>Email</lable> <asp:TextBox runat="server" ID="emailbox"  CssClass="form-control"/>

A table is also on the same page for showing details of users & and anchor tag to edit the record ie

<asp:HyperLink NavigateUrl='<%# Eval("EmployeeID","~/SystemUserForms/Index.aspx?uid={0}&Action=Edit") %>' Text="Edit" runat="server" />

Here is My PageLoad in CodeBehind File

 protected void Page_Load(object sender, EventArgs e) { 
    if (Request.QueryString["uno"]!=null && Request.QueryString["Action"]!=null)
    {
    
    string uid= Request.QueryString[0];
    string action = Request.QueryString[1];
    registerbtn.Text = "Update Records";//button control text changing
    CoreModel.Repository.SysUsers S=               CoreModel.Repository.UserRepository.getUserByID(Convert.ToInt32(uid));
    
    
    
    usernamebox.Text = S.UserName;
    emailbox.Text = S.email;
   
    }
    
    
}

asp:button control onclick handler is

protected void  Register_Users(object sender, EventArgs e)
 {

     if (Page.IsValid)
      {
             if(registerbtn.Text="Insert"){
                     insert()
                   }else if(registerbtn.Text="Update")
                      {  
                        string un=usernamebox.Text 
                        string e=emailbox.Text 

                      /* here em getting the old values ie if after fetching records from database  the usertextbox  text is bob  and i updated to bob.smith but  usernamebox.text returning bob */
                         /// update will goes here updation()


                       }

       }

}