File Upload Limit

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.IO;

using System.Data.SqlClient;

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

{

   SqlConnection con=new SqlConnection("Data Source=AAPTI\\SQLEXPRESS;Initial Catalog=prashanth;Integrated Security=True");

   protected void Page_Load(object sender, EventArgs e)

   {

   }

   protected void Button1_Click(object sender, EventArgs e)

   {

       if(FileUpload1.HasFile)

       {

           if(FileUpload1.PostedFile.ContentLength<2100000)

           {

              

               string[] A=new string[]{".jpeg",".pdf",".txt",".doc"};

               //FileUpload1.SaveAs(Server.MapPath("~/files"+extension));

               string extension = Path.GetExtension(FileUpload1.FileName);

               if (A.Contains(extension))

               {

                   string filename = Path.GetFileName(FileUpload1.PostedFile.FileName);

                  string filepath = (Server.MapPath("~/images/" + filename));

                   

                   FileUpload1.SaveAs(filepath);

                   SqlCommand cmd = new SqlCommand("insert into updwnload values('" + filename + "','"+filepath+"') ", con);

                   con.Open();

                   cmd.ExecuteNonQuery();

                   Response.Write("inserted");

                   Label1.Text = "filename:" + FileUpload1.PostedFile.FileName + "<br>" + FileUpload1.PostedFile.ContentLength + "<br>" + FileUpload1.PostedFile.ContentType;

               }

               else

               {

                   Response.Write("selected file type is nt supported");

               }

           }

           else

           {

               Response.Write("size is above 2mb");

           }

       }

           else

           {

               Response.Write("invalid");

           }

       }

               

   }