C# generate random string of different length

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If you want to generate random strings of different different lengths, than use below function. Here size is an input variable for length of string.

    public static string RandomString(int size)
      {
            string builder = string.Empty;
             Random random = new Random();
             char ch;
             for (int i = 0; i < size; i++)
             {
                 ch = Convert.ToChar(Convert.ToInt32(Math.Floor(26 * random.NextDouble() + 65)));
                 builder += ch.ToString();
             }

             return builder.ToString();
         }

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