Changing Master Page dynamically and inserting records

using System;

using System.Collections;

using System.Configuration;

using System.Data;

using System.Linq;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.HtmlControls;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Xml.Linq;

using System.IO;

using System.Text;

public partial class InsertEmployee : System.Web.UI.Page

{

    public string Message,EmployeeName,DepartmentName,Logo;

    public bool Active;

    public int Salary;

    Class1 c1 = new Class1();

    protected override void  OnPreInit(EventArgs e)

    {

        base.OnPreInit(e);

        if (HttpContext.Current.Request.Url.AbsoluteUri.Contains("InsertEmployee.aspx"))

        {

            base.MasterPageFile = "MasterPage.master";

        }

        //if (Request.Url.Host.Contains("InsertEmployee.aspx"))

        //{

        //    base.MasterPageFile = Server.MapPath("MasterPage1.master");

        //}

        else

        {

            

            base.MasterPageFile = "MasterPage1.master";

        }

    }

    protected void Page_Load(object sender, EventArgs e)

    {

        //string id = Request.QueryString["id"].ToString();

        //if (id != "")

        //{

           

        //}

        string UserName = Session["UserName"]!=null?Session["UserName"].ToString():"";

        if (UserName == "")

        {

            Response.Redirect("Login.aspx");

        }

    }

   

    protected void LoadData()

    {

        EmployeeName = txtEmpName.Text.ToString();

        DepartmentName = txtDeptName.Text.ToString();

        Salary = int.Parse(txtSalary.Text.ToString());

        Logo = Path.GetFileName(FileUpload1.FileName);

        Active = chkActive.Checked;

        string filename = Server.MapPath("Images\\" + Logo);

        FileUpload1.SaveAs(filename);

       

      

        c1.InsertEmployee(EmployeeName, DepartmentName, Salary, Logo,Active);

        Message = "Record Inserted Successfully";

        

       

    }

    protected void btnSave_Click(object sender, EventArgs e)

    {

        LoadData();

        Clear();

    }

    protected void Clear()

    {

        txtEmpName.Text = "";

        txtDeptName.Text = "";

        txtSalary.Text = "";

    }

   

}