Error C# - Additional information: Delegate to an instance method cannot have null 'this'

[Gani tpt]

I am writing the below code. i am getting error below.

An unhandled exception of type 'System.ArgumentException' occurred in mscorlib.dll

Additional information: Delegate to an instance method cannot have null 'this'.


complete source code


DataTable dt = new DataTable();
dt.Columns.Add(new DataColumn("LIMETYPE", typeof(string)));
dt.Columns.Add(new DataColumn("DIG1", typeof(string)));
dt.Columns.Add(new DataColumn("DIG2", typeof(string)));
dt.Columns.Add(new DataColumn("DIG3", typeof(string)));


dt.Rows.Add(new object[] { "2", "", "4", "5" });
dt.Rows.Add(new object[] { "5(LIM)", "", "20", "" });
dt.Rows.Add(new object[] { "8(LIM)", "10", "", "" });

string resultval = "5(LIM)";
Qry = (from r in dt.AsEnumerable()
where ContainsStringExtensions.ContainsAny(r.Field<string>("LIMETYPE"), resultval)
&& !string.IsNullOrWhiteSpace(r.Field<string>("LIMETYPE"))
select new
{

}).Count();


if (Qry > 0)
{
//Getting Final value here
}



public static class ContainsStringExtensions
{
public static bool ContainsAny(this string haystack, IEnumerable<string> filterList)
{
return filterList.Any(haystack.Contains); //Error - Additional information: Delegate to an instance method cannot have null 'this'.
}
}


in my table some of the cells are blank. why the error is passing to "ContainsStringExtensions".

pls. give me suggestions and where to correct the code...?

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