Check if a string can be obtained by rotating another string d places

using System;

// C# program to check if a string is two time
// rotation of another string.
public class Test {

  static string ReverseArray(char[] arr, int left, int right)
  {
    char temp;
    while (left < right) {
      temp = arr[left];
      arr[left] = arr[right];
      arr[right] = temp;
      left++;
      right--;
    }
    return String.Join("",arr);
  }

  // Method to check if string2 is obtained by
  // string 1
  public static bool RotateAndCheck(string str1, string str2, int d)
  {
    if (str1.Length != str2.Length) {
      return false;
    }

    // Left Rotation string will contain
    // the string rotated Anti-Clockwise
    // Right Rotation string will contain
    // the string rotated Clockwise
    string left_rot_str1="", right_rot_str1="";
    bool left_flag = true, right_flag = true;
    int len1 = str1.Length;

    // Copying the str1 string to left rotation string
    // and right rotation string
    for (int i = 0; i < len1; i++) {
      left_rot_str1+=str1[i];
      right_rot_str1+=str1[i];
    }

    // Rotating the string d positions to the left
    left_rot_str1=ReverseArray(left_rot_str1.ToCharArray(), 0, d - 1);
    left_rot_str1=ReverseArray(left_rot_str1.ToCharArray(), d, len1 - 1);
    left_rot_str1=ReverseArray(left_rot_str1.ToCharArray(), 0, len1 - 1);

    // Rotating the string d positions to the right
    right_rot_str1=ReverseArray(right_rot_str1.ToCharArray(), 0, len1 - d - 1);
    right_rot_str1=ReverseArray(right_rot_str1.ToCharArray(), len1 - d, len1 - 1);
    right_rot_str1=ReverseArray(right_rot_str1.ToCharArray(), 0, len1 - 1);

    // Comparing the rotated strings
    for (int i = 0; i < len1; i++) {

      // If cannot be made equal with left rotation
      if (left_rot_str1[i] != str2[i]) {
        left_flag = false;
      }

      // If cannot be made equal with right rotation
      if (right_rot_str1[i] != str2[i]) {
        right_flag = false;
      }
    }

    // If both or any one of the rotations
    // of str1 were equal to str2
    if (left_flag || right_flag)
      return true;
    return false;
  }

  // Driver code
  public static void Main(string[] args)
  {
    string str1 = "abcdefg";
    string str2 = "cdefgab";

    // d is the rotating factor
    int d = 2;

    // In case length of str1 < d
    d = d % str1.Length;

    Console.WriteLine(RotateAndCheck(str1, str2,d) ? "Yes"
                      : "No");
  }
}

// This code is contributed by Aarti_Rathi