Generate password Randomnly in asp.Net

How to Generate password Randomnly in asp.Net.

Step 1:Take button And Label

Step 2:Create Method:

Write code following:

 public static string createrandompwd(int pwdlength)
    {
        string _a = "0123456789abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNOPQRST";
        Random r = new Random();
        char[] arr = new char[pwdlength];
        int allchrcount = _a.Length;
        for (int i = 0; i < pwdlength; i++)
        {
            arr[i] = _a[(int)((_a.Length) * r.NextDouble())];
        }
        return new string(arr);
    }
}

Step 3:Button Double click:

Label1.Text = createrandompwd(7);