Object reference not set to an instance of an object - during fileupload1 in ASP.NET

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C#

ASP.NET

ASP.NET4

I get "Object reference not set to an instance of an object" - during FileUpload1. I know the issue is null value in fileuplod1. But if I run the same code on another project then it is working fine. But when I run this code on my actual project it gets error "Object reference not set to an instance of an object".

Please help some...

What I have tried:

string filename = Path.GetFileName(FileUpload1.PostedFile.FileName);
string contentType = FileUpload1.PostedFile.ContentType;
using (Stream fs = FileUpload1.PostedFile.InputStream)
{
using (BinaryReader br = new BinaryReader(fs))
{
byte[] bytes = br.ReadBytes((Int32)fs.Length);
string constr = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
using (SqlConnection con = new SqlConnection(constr))
{
string query = "insert into tblFiles values (@Name, @ContentType, @Data)";
using (SqlCommand cmd = new SqlCommand(query))
{
cmd.Connection = con;
cmd.Parameters.AddWithValue("@Name", filename);
cmd.Parameters.AddWithValue("@ContentType", contentType);
cmd.Parameters.AddWithValue("@Data", bytes);
con.Open();
cmd.ExecuteNonQuery();
con.Close();
}
}
}
BindGrid();
}
Response.Redirect(Request.Url.AbsoluteUri);
}