Remove all non-ASCII characters from string

Question

I have a C# routine that imports data from a CSV file, matches it against a database and then rewrites it to a file. The source file seems to have a few non-ASCII characters

Answer 1

Here a simple solution:

public static bool IsASCII(this string value)
{
    // ASCII encoding replaces non-ascii with question marks, so we use UTF8 to see if multi-byte sequences are there
    return Encoding.UTF8.GetByteCount(value) == value.Length;
}

source: http://snipplr.com/view/35806/