Specifying maxlength for multiline textbox

Question

I\'m trying to use asp:

I want a way to spe

Answer 1

This is the same as @KeithK's answer, but with a few more details. First, create a new control based on TextBox.

using System.Web.UI;
using System.Web.UI.WebControls;

namespace MyProject
{
    public class LimitedMultiLineTextBox : System.Web.UI.WebControls.TextBox
    {
        protected override void Render(HtmlTextWriter writer)
        {
            this.TextMode = TextBoxMode.MultiLine;

            if (this.MaxLength > 0)
            {
                writer.AddAttribute(HtmlTextWriterAttribute.Maxlength, this.MaxLength.ToString());
            }

            base.Render(writer);
        }
    }
}  

Note that the code above always sets the textmode to multiline.

In order to use this, you need to register it on the aspx page. This is required because you'll need to reference it using the TagPrefix, otherwise compilation will complain about custom generic controls.

<%@ Register Assembly="MyProject" Namespace="MyProject" TagPrefix="mp" %>