using 2 master pages for admin and user

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I am developing a application with 2 master pages one for admin and one for user. I am having problem setting MasterPageFile in Page_preInit. I have tried the following:

C#

protected void LoginButton_Click(object sender, EventArgs e)
        {
            SqlConnection con=new SqlConnection(@"Data Source=ashish-pc\;Initial Catalog=HMS;Integrated Security=True");
            con.Open();
            SqlCommand cmd = new SqlCommand("select * from Login where UserName=@UserName and Password=@Password", con);
            cmd.Parameters.AddWithValue("@UserName", UserName.Text.Trim() );
            cmd.Parameters.AddWithValue("@Password", Password.Text.Trim());
                        
            SqlDataAdapter da = new SqlDataAdapter();
            da.SelectCommand = cmd;
           // DataSet dt = new DataSet();
            DataTable dt = new DataTable();
            da.Fill(dt);
            if (dt.Rows.Count>0)
            {
                Session["UserName"] = UserName.Text;
                
                Session.Timeout = 10;
                if (dt.Rows[0]["SuperUser"].ToString() == "True")
                {
                    Response.Redirect("/Home.aspx");
                    
                }


                else
                {

                    Response.Redirect("/Appointment.aspx");

                }
                
               
            }
            else 
            {
                 Response.Write("Invalid username and password");
            }
            con.Close();
        }
        protected void page_PreInit(Object sender, EventArgs e)
        {
            if (Session["SuperUser"].ToString() != "true")
            {
                MasterPageFile = "~/Site1.Master";
            }
            else
            {
                MasterPageFile = "~/Site2.Master";
            }
        }

        
    }

i got error:

Server Error in '/' Application.

Object reference not set to an instance of an object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error: 


Line 59:         protected void page_PreInit(Object sender, EventArgs e)
Line 60:         {
Line 61:             if (Session["SuperUser"].ToString() != "true")
Line 62:             {
Line 63:                 MasterPageFile = "~/Site1.Master";

Source File: C:\Users\Ashish\Documents\Visual Studio 2010\Projects\tp\tp\Account\Login.aspx.cs    Line: 61 

Stack Trace: 


[NullReferenceException: Object reference not set to an instance of an object.]
   tp.Login.page_PreInit(Object sender, EventArgs e) in C:\Users\Ashish\Documents\Visual Studio 2010\Projects\tp\tp\Account\Login.aspx.cs:61
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
   System.Web.UI.Page.OnPreInit(EventArgs e) +8871966
   System.Web.UI.Page.PerformPreInit() +31
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +328

please help me. i got stuck here.

Posted 15-Apr-14 4:03am

Member 9764132

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Sanket Saxena · Accepted Answer · 2014-04-15T04:29:00

Actually your Session["SuperUser"] is null and you are checking Session["SuperUser"].ToString()
which is not converting the null value to ToString()

you have to manage like this:

C#

 if(Session["SuperUser"]!=null)
     {
        if (Session["SuperUser"].ToString() != "true")
          {
              MasterPageFile = "~/Site1.Master";
          }
          else
          {
              MasterPageFile = "~/Site2.Master";
          }
     }
else
{
  //do something or show Site2.Master
}