How do I solve this ob

See more:

ASP.NET

SQL

C#5.0

This is what happens when I click submit button

if (btn_add.Text == "Submit")
       {
           string BracketSuspensionType = Convert.ToString(txt_BracketSuspensionType.Text.Trim());
           string PoleTypeID = Convert.ToString(dd_PoleTypeID.SelectedValue.Trim());
           string Status = chk_Active.Checked ? "True" :"False" ;
           System.Collections.Hashtable ht = (System.Collections.Hashtable)Session["UserDetails"];
           Int64 UsrId = (Int64)ht["UserID"];
           string CreatedBy = UsrId.ToString();
           //string CreatedOn = (DateTime.Now);
           string filename = Path.GetFileName(fileuploadimages.PostedFile.FileName);
           fileuploadimages.SaveAs(Server.MapPath("~/Images/" + filename));
           SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["valmont"].ToString());
           con.Open();
           SqlCommand cmd = new SqlCommand("Insert into DEF_BRACKET_ACCESSORIES_MST(BracketSuspensionType,PoleTypeID,Status,CreatedBy,CreatedOn,ImagePath) values(@BracketSuspensionType,@PoleTypeID,Status,@CreatedBy,@CreatedOn,@ImagePath)", con);

           cmd.Parameters.AddWithValue("@BracketSuspensionType", BracketSuspensionType);
           cmd.Parameters.AddWithValue("@PoleTypeID", PoleTypeID);
           cmd.Parameters.AddWithValue("@Status", Status);
           cmd.Parameters.AddWithValue("@CreatedBy", CreatedBy);
           //cmd.Parameters.AddWithValue("@CreatedOn", CreatedOn);
           cmd.Parameters.AddWithValue("@ImagePath", "Images/" + filename);


           cmd.ExecuteNonQuery();
           con.Close();

Error - An exception of type 'System.NullReferenceException' occurred in App_Web_vbsffejd.dll but was not handled in user code

Additional information: Object reference not set to an instance of an object.

Error on Line-

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

Please suggest