<p>using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.IO;
using System.Xml;
using System.Text.RegularExpressions;
public static class GlobalExtensionMethods
{
  public static bool Contains(this string source, string toSeek, StringComparison comparisonType)
  {
    return source.IndexOf(toSeek, comparisonType) &gt;= 0;
  }
}

</p>