MD5加密

private void buttonX1_Click (object sender, EventArgs e)
{
    System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create();
    byte[] data = md5.ComputeHash (System.Text.Encoding.Default.GetBytes (txt_put.Text.Trim() ) );
    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < data.Length; i++)
    {
        sb.Append (data[i].ToString ("x2") );
    }
    textBox1.Text = sb.ToString();
}