Joins the key/value pairs into a string : String Util « Data Types « C# / C Sharp

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C# / C Sharp » Data Types » String UtilScreenshots 
Joins the key/value pairs into a string

using System;
using System.ComponentModel;
using System.IO;
using System.Text;
using System.Xml;

namespace System.Collections.Specialized
  /// <summary>
  /// Represents a collection of useful extenions methods.
  /// </summary>
  public static class NameValueCollectionExtensons

    /// <summary>
    /// Joins the key/value pairs into a string of the follwing format:
    /// "Key1=Value1|Key2=Value2|...".
    /// </summary>
    public static string Join(this NameValueCollection collection)
      return Join(collection, "|");

    /// <summary>
    /// Joins the key/value pairs into a string of the follwing format:
    /// "Key1=Value1|Key2=Value2|...".
    /// </summary>
    public static string Join(this NameValueCollection collection, string separator)
        throw new ArgumentNullException("separator");

      StringBuilder sb = new StringBuilder();
      foreach(string key in collection.AllKeys)
        sb.AppendFormat("{0}={1}{2}", key, (collection[key?? string.Empty).ToString(), separator);

      return sb.ToString().TrimEnd(separator.ToCharArray());


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