How to make String.Contains case insensitive?

How can I make the following case insensitive?

myString1.Contains("AbC")

c#
.net
vb.net
string
case-insensitive

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小开

bool b = list.Contains("Hello", StringComparer.CurrentCultureIgnoreCase);

[EDIT] extension code:

public static bool Contains(this string source, string cont
, StringComparison compare)
{
return source.IndexOf(cont, compare) >= 0;
}

This could work :)

小开

You can use:

if (myString1.IndexOf("AbC", StringComparison.OrdinalIgnoreCase) >=0) {
//...
}

This works with any .NET version.

小开

You can create your own extension method to do this:

public static bool Contains(this string source, string toCheck, StringComparison comp)
{
return source != null && toCheck != null && source.IndexOf(toCheck, comp) >= 0;
}

And then call:

 mystring.Contains(myStringToCheck, StringComparison.OrdinalIgnoreCase);