Question

I am currently trying to create a statement where if it returns false then a label will display on the page with an error message. I have tried using Response.Write with no results.

if (bannedDomainText.Text.Contains("."))
    File.AppendAllText(MapPath(FILE_PATH), "\r\n" + bannedDomainText.Text);
else
    Response.Write("<label>This isn't working!</label>");

Answer 1

Html

<asp:Label ID="ErrorMessage" Visible="false"></asp:Label>

Code

if (bannedDomainText.Text.Contains("."))
    File.AppendAllText(MapPath(FILE_PATH), "\r\n" + bannedDomainText.Text);
else
{
    Message.Text =  "This is working";
    Message.Visible = true;
}