How to add array elements to a string

// Assign array to string //

string[] array = new string[$a];

// Split array //
array[0]="root";
array[1]="snapp";
like this ......
// Call the methods.////
//
string result1 = ConvertStringArrayToString(array);
// Display the results.
//
Console.WriteLine(result1);

static string ConvertStringArrayToString(string[] array)
   {
   //
   // Concatenate all the elements into a StringBuilder.
   //
   StringBuilder builder = new StringBuilder();
   foreach (string value in array)
   {
       builder.Append(value);
       builder.Append(',');
   }
   return builder.ToString();
   }


 Since i am new to c# hope this help full....