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Returning a string with delimiter seperated from string builder

public  string PassSBR(string[] arr)
        {
            var builder = new System.Text.StringBuilder();
            try
            {
                foreach (string s in arr)
                {
                    builder.Append(s).Append(";");
                }
            }
            catch (Exception ex)
            {
          Response.Write(ex.ToString());
            }
            return builder.ToString(); // Has ending ;difference
        }