Question

I am binding some data to control, but want to limit the number of character of a specific field to a 30 first characters.

I want to do it, if it’s possible, on aspx page.

I tried this:

Text='<%# String.Format("{0}", Eval("Title")).Substring(0,30) %> '

But got this error:

Index and length must refer to a
location within the string. Parameter
name: length

Answer 1

As Simon says, you’ll encounter this error when the string is less than 30 characters.

You can write a protected method in your page –

protected string GetSubstring(string str, int length)
{
    return str.Length > length ? str.Substring(0, length) : str;
}

Call it from the aspx code like this –

Text='<%# String.Format("{0}", GetSubstring(Eval("Title").ToString(), 30) %>'