Object reference not set to an instance of an object(???)

Question

Hi!

 

I am testing my code. Curiously, later after running I have this message (Object reference not set to an instance of an object) pointed on this line here:

string connStr = ConfigurationManager.AppSettings["Data Source=LUNASOFTRESEARC\\SQLEXPRESS;Initial Catalog=RentMyWrox;Integrated Security=True"].ToString(); 

I need your help please. Thank you!

 

string fileName = FileUpload1.PostedFile.FileName;

int fileLength = FileUpload1.PostedFile.ContentLength;

byte[] imageBytes = new byte[fileLength];

FileUpload1.PostedFile.InputStream.Read(imageBytes, 0, fileLength);

string connStr = ConfigurationManager.AppSettings["Data Source=LUNASOFTRESEARC\\SQLEXPRESS;Initial Catalog=RentMyWrox;Integrated Security=True"].ToString(); //Here where is the bugg

using (SqlConnection conn = new SqlConnection(connStr))

{

string sql = "INSERT INTO ImageUpload (PictureName, PictureFile) VALUES (@pictureName, @pictureFile)";

SqlParameter[] prms = new SqlParameter[2];

prms[0] = new SqlParameter("@pictureName", SqlDbType.VarChar, 50);

prms[0].Value = fileName;

prms[1] = new SqlParameter("@pictureFile", SqlDbType.Image);

prms[1].Value = imageBytes;

using (SqlCommand cmd = new SqlCommand(sql, conn))

{

cmd.Parameters.AddRange(prms);

conn.Open();

cmd.ExecuteNonQuery();

conn.Close();

}

lblMessage.Text = "Picture uploaded successsfully !";

}