A potentially dangerous Request.Form value was detected from the client

Question

Every time a user posts something containing < or > in a page in my web application, I get this exception thrown.

I don\'t want to go

Answer 1

In ASP.NET, you can catch the exception and do something about it, such as displaying a friendly message or redirect to another page... Also there is a possibility that you can handle the validation by yourself...

Display friendly message:

protected override void OnError(EventArgs e)
{
    base.OnError(e);
    var ex = Server.GetLastError().GetBaseException();
    if (ex is System.Web.HttpRequestValidationException)
    {
        Response.Clear();
        Response.Write("Invalid characters."); //  Response.Write(HttpUtility.HtmlEncode(ex.Message));
        Response.StatusCode = 200;
        Response.End();
    }
}