使用MD5加密用戶密碼

/// <summary>
/// 轉換成MD5文件
/// </summary>
/// <param name="str">字符串</param>
/// <returns>結果</returns>
public static string ConvertMD5(string str)
{
byte[] b=System.Text.Encoding.Default.GetBytes(str);
b=new System.Security.Cryptography.MD5CryptoServiceProvider().ComputeHash(b);
StringBuilder sb = new StringBuilder();
for(int i=0;i<b.Length;i++)
{ 
sb.Append(b[i].ToString ("x").PadLeft(2,'0'));
} 


return sb.ToString();

}