using System;

using System.Collections.Generic;

using System.Linq;

using System.Globalization;

public class Program

{

    public static void Main()

    {

        var dict=new Dictionary<string,string>(StringComparer.InvariantCultureIgnoreCase){

            {"xid","22"},

            {"ter","44"},           

            {"pointamount",""},

​

        };

        var result2=GetValue(dict,"pointamount");

        Console.WriteLine("result2:" + result2);

​

        var c= Convert.ToDecimal(result2, CultureInfo.InvariantCulture);

        Console.WriteLine(c);           

    }

     public static TValue GetValue<TKey, TValue>(IDictionary<TKey, TValue> dictionary, TKey key)

        {

            TValue value;

            dictionary.TryGetValue(key, out value);

            return value;

        }

         public static string GetValueCaseInSensitive(IDictionary<string, string> dictionary, string key)

        {

         var valueCaseInSensitive = dictionary.SingleOrDefault(x => string.Equals(x.Key, key, StringComparison.OrdinalIgnoreCase));

            return valueCaseInSensitive.Value;

        }

}