Max Char in TextBox C#?

Question

Just wondering how many char can C# Textbox multiline hold?

Answer 1

Look at the MaxLength property of the TextBox - it stores the maximum number of characters the control can take; as per the documentation, it is changeable. Usually the default is big enough, though. (Although I imagine that since you're asing the question, it may not be!)

From the docs, you can see that the maximum value for MaxLength is 4294967295. This is, of course, limited by the memory of the target machine.

Answer 2

I don't think there's any fixed limit on the size of text you can put in a Windows.Forms.TextBox (specifying C# is irrelevant). I've thrown several megabytes of character data in there at times, and it's worked in a satisfactory manner.

However, there may be practical limit - the control isn't oriented towards handling large amounts of text, so performance goes down as the volume goes up.

Depending on the hardware of your users, this may or may not be an issue.

If you need to provide good editing of multi-megabyte text areas, using a properly designed editing control would be a good idea.

Answer 3

The other answers seems to assume WinForms development.

If the case that you are doing ASP.NET development, please be aware that the MaxLength property of the System.Web.UI.WebControls.TextBox class is ignored when TextMode = Multiline. The reason is simple: the <textarea> HTML element does not provide any way to restrict the length of its contents.

You will need to do some client scripting in order to enforce a max length on a textarea.