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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();          }

 If you want to generate a random nomber in a range than use below function. it has two inputs "min" -  enter min value of your range and "max" - enter max value of your range.  public static int RandomNumber( int min , int max )          {              Random random = new Random ();              return random.Next(min, max);          } Here in above function Random is a class. this is exist in .net framework by default. you should only use namespace "using System" for this.