Text change on message box

using System;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using System.Drawing.Drawing2D;

namespace CostumeMessageBox 
{
    public partial class frmShowMessage : Form
    {
        Button btnOk = new Button();  //Create object of Button.
        Button btnCancel = new Button();
        Button btnNo = new Button();
        Button btnYes = new Button();
        public const int WM_NCLBUTTONDOWN = 0xA1;
        public const int HT_CAPTION = 0x2;

        [DllImportAttribute("user32.dll")]
        public static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);
        [DllImport("user32.dll")]
        public static extern bool ReleaseCapture();
        public frmShowMessage()
        {
            InitializeComponent();
        }

        /// 

        /// Here I am overriding Paint method of form object
        /// and set it's background color as gradient. Here I am
        /// using LinearGradientBrush class object to make gradient
        /// color which comes in System.Drawing.Drawing2D namespace.
        /// 
        /// 
        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);
            ControlPaint.DrawBorder(e.Graphics, ClientRectangle,
                                    Color.DarkRed, 3, ButtonBorderStyle.Solid,
                                    Color.DarkRed, 3, ButtonBorderStyle.Solid,
                                    Color.DarkRed, 3, ButtonBorderStyle.Solid,
                                    Color.DarkRed, 3, ButtonBorderStyle.Solid);
            //Rectangle rect = this.ClientRectangle;
            //LinearGradientBrush brush = new LinearGradientBrush(rect, Color.Snow, Color.SeaShell, 60); //LightCyan Lavender LightGray
            //e.Graphics.FillRectangle(brush, rect);
            //base.OnPaint(e);
        }

        private void frmShowMessage_Load(object sender, EventArgs e)
        {
            btnOk.Text = "?????";  //Here we set text of Button.
            btnOk.DialogResult = DialogResult.OK;  //Set DialogResult property of button.
            btnOk.FlatStyle = FlatStyle.Popup;  //Set flat appearence of button.
            btnOk.BackColor = Color.Beige;
            btnOk.FlatAppearance.BorderSize = 0;

            btnCancel.Text = "??????";
            btnCancel.DialogResult = DialogResult.Cancel;
            btnCancel.FlatStyle = FlatStyle.Popup;
            btnCancel.BackColor = Color.Beige;
            btnCancel.FlatAppearance.BorderSize = 0;

            btnNo.Text = "???";
            btnNo.DialogResult = DialogResult.No;
            btnNo.FlatStyle = FlatStyle.Popup;
            btnNo.BackColor = Color.Beige;
            btnNo.FlatAppearance.BorderSize = 0;

            btnYes.Text = "???";
            btnYes.DialogResult = DialogResult.Yes;
            btnYes.FlatStyle = FlatStyle.Popup;
            btnYes.BackColor = Color.Beige;
            btnYes.FlatAppearance.BorderSize = 0;
        }


        /// 

        /// setMessage method is used to display message
        /// on form and it's height adjust automatically.
        /// I am displaying message in a Label control.
        /// 
        /// Message which needs to be displayed to user.
        private void setMessage(string messageText)
        {
            int number = Math.Abs(messageText.Length / 30);
            if (number != 0)
            {
                lblMessageText.Height = lblRightBorder.Height = number*25;
                Height = lblMessageText.Height;
            }

            lblMessageText.Text = messageText;
        }

        /// 

        /// This method is used to add button on message box.
        /// 
        /// MessageButton is type of enumMessageButton
        /// through which I get type of button which needs to be displayed.
        private void addButton(enumMessageButton MessageButton)
        {
            switch (MessageButton)
            {
                case enumMessageButton.OK:
                    {
                        //If type of enumButton is OK then we add OK button only.
                        btnOk.SetBounds(pnlShowMessage.ClientSize.Width - 80, 5, 75, 25);  // Set bounds of button.
                        pnlShowMessage.Controls.Add(btnOk);  //Finally Add button control on panel.
                    }
                    break;
                case enumMessageButton.OKCancel:
                    {
                        btnOk.SetBounds((pnlShowMessage.ClientSize.Width - 70), 5, 65, 25);
                        pnlShowMessage.Controls.Add(btnOk);

                        btnCancel.SetBounds((pnlShowMessage.ClientSize.Width - (btnOk.ClientSize.Width + 5 + 80)), 5, 75, 25);
                        pnlShowMessage.Controls.Add(btnCancel);

                    }
                    break;
                case enumMessageButton.YesNo:
                    {

                        btnNo.SetBounds((pnlShowMessage.ClientSize.Width - 70), 5, 65, 25);
                        pnlShowMessage.Controls.Add(btnNo);

                        btnYes.SetBounds((pnlShowMessage.ClientSize.Width - (btnNo.ClientSize.Width + 5 + 80)), 5, 75, 25);
                        pnlShowMessage.Controls.Add(btnYes);
                    }
                    break;
                case enumMessageButton.YesNoCancel:
                    {
                        btnCancel.SetBounds((pnlShowMessage.ClientSize.Width - 70), 5, 65, 25);
                        pnlShowMessage.Controls.Add(btnCancel);

                        btnNo.SetBounds((pnlShowMessage.ClientSize.Width - (btnCancel.ClientSize.Width + 5 + 80)), 5, 75, 25);
                        pnlShowMessage.Controls.Add(btnNo);

                        btnYes.SetBounds((pnlShowMessage.ClientSize.Width - (btnCancel.ClientSize.Width + btnNo.ClientSize.Width + 10 + 80)), 5, 75, 25);
                        pnlShowMessage.Controls.Add(btnYes);
                    }
                    break;
            }
        }

        /// 

        /// We can use this method to add image on message box.
        /// I had taken all images in ImageList control so that
        /// I can eaily add images. Image is displayed in 
        /// PictureBox control.
        /// 
        /// Type of image to be displayed.
        private void addIconImage(enumMessageIcon MessageIcon)
        {
            switch (MessageIcon)
            {
                case enumMessageIcon.Error:
                    pictureBox1.Image = imageList1.Images["Error"];  //Error is key name in imagelist control which uniqly identified images in ImageList control.
                    break;
                case enumMessageIcon.Information:
                    pictureBox1.Image = imageList1.Images["Information"];
                    break;
                case enumMessageIcon.Question:
                    pictureBox1.Image = imageList1.Images["Question"];
                    break;
                case enumMessageIcon.Warning:
                    pictureBox1.Image = imageList1.Images["Warning"];
                    break;
            }
        }

        #region Overloaded Show message to display message box.

        /// 

        /// Show method is overloaded which is used to display message
        /// and this is static method so that we don't need to create 
        /// object of this class to call this method.
        /// 
        /// 
        internal static DialogResult Show(string messageText)
        {
            frmShowMessage frmMessage = new frmShowMessage();
            frmMessage.setMessage(messageText);
            frmMessage.addIconImage(enumMessageIcon.Information);
            frmMessage.addButton(enumMessageButton.OK);
            frmMessage.ShowDialog();
            return frmMessage.DialogResult;
        }

        internal static DialogResult Show(string messageText, string messageTitle)
        {
            frmShowMessage frmMessage = new frmShowMessage();
            frmMessage.Text = messageTitle;
            frmMessage.setMessage(messageText);
            frmMessage.addIconImage(enumMessageIcon.Information);
            frmMessage.addButton(enumMessageButton.OK);
            frmMessage.ShowDialog();
            return frmMessage.DialogResult;
        }

        internal static DialogResult Show(string messageText, string messageTitle, enumMessageIcon messageIcon,
                                          enumMessageButton messageButton)
        {
            frmShowMessage frmMessage = new frmShowMessage();
            frmMessage.setMessage(messageText);
            frmMessage.Text = messageTitle;
            frmMessage.addIconImage(messageIcon);
            frmMessage.addButton(messageButton);
            frmMessage.ShowDialog();
            return frmMessage.DialogResult;
        }

        #endregion


        private void frmShowMessage_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button != MouseButtons.Left) return;
            ReleaseCapture();
            SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);

        }

    }

    #region constant defiend in form of enumration which is used in showMessage class.

    internal enum enumMessageIcon
    {
        Error,
        Warning,
        Information,
        Question,
    }

    internal enum enumMessageButton
    {
        OK,
        YesNo,
        YesNoCancel,
        OKCancel
    }

    #endregion
}