SRC_C#: OemToChar for c#

[DllImport("user32.dll")]
static extern bool OemToCharA(char[] lpszSrc, [Out] StringBuilder lpszDst);

public static string OemToChar1(string str)
{
    if( string.IsNullOrEmpty(str) ) return str;

    StringBuilder strBuilder = new StringBuilder(str.Length);
    OemToCharA(str.ToCharArray(), strBuilder);
    return strBuilder.ToString();
}