protected void goButton_OnClick(object sender, EventArgs e) { if (authorIdTextBox.Text!="") { int id = Convert.ToInt32(authorIdTextBox.Text); bool isAuthor = authorManager.CheckAuthorId(id); if (!isAuthor) { Response.Write("<script>alert('Please Insert Right ID');</script>"); } else { author = authorManager.GetAuthorName(id); authorIdTextBox.Text = author.AuthorId.ToString(); authorNameTextBox.Text = author.AuthorName; } } else { Response.Write("<script>alert('Please Insert Author Id');</script>"); } }