frmMessageBox frm = new frmMessageBox("提示", "数据连接失败,请重试!", 0);

frm.ShowDialog();

frm.Dispose();

GC.Collect();

frmMessageBox frm = new frmMessageBox("删除用户", "确定删除用户?", 1);

frm.ShowDialog();

frm.Dispose();//模式窗体不会自动调用资源清理,需手动清理,否则会内存溢出

GC.Collect();
if (frm.DialogResult != DialogResult.OK) return;
//执行的操作

public partial class frmMessageBox : Form

    {

        private bool normalmoving = false;

        private Point oldMousePosition;

        /// <summary>

        /// type=0/1:0表示无取消按钮;1表示有确定和取消按钮

        /// </summary>

        /// <param name="type"></param>

        public frmMessageBox(int type)

        {

            InitializeComponent();

            InitButton(type);

        }

        private void InitButton(int type)

        {

            if (type == 0)

            {

                this.btnOK.Location = new System.Drawing.Point(195, 160);

                this.button2.Visible = false;

            }

        }

        public frmMessageBox(string Title, string Message, int type):this(type)

        {

            this.Message = Message;

            this.Title = Title;

        }

        /// <summary>

        /// Message

        /// </summary>

        public string Message

        {

            set

            {

                this.lblMessage.Text = value;

            }

        }

        /// <summary>

        /// Title

        /// </summary>

        public string Title

        {

            set

            {

               this.lblTitle.Text = value;

            }

        }

        /// <summary>

        /// 确定事件

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void btnOK_Click(object sender, EventArgs e)

        {

            //1.返回一个值,给调用者

            this.DialogResult = DialogResult.OK;

            //2.关闭

            this.Close();

        }

        /// <summary>

        /// 取消事件

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void picCancle_Click(object sender, EventArgs e)

        {

            this.DialogResult = DialogResult.Cancel;

            this.Close();

        }

        private void frmMessageBox_Load(object sender, EventArgs e)

        {

        }

        #region 标题栏的相关事件

        private void pnlTitle_MouseDown(object sender, MouseEventArgs e)

        {

            if (this.WindowState == FormWindowState.Maximized)

            {

                return;

            }

            //Titlepanel.Cursor = Cursors.NoMove2D;

            oldMousePosition = e.Location;

            //moving = true;

            normalmoving = true;

        }

        private void pnlTitle_MouseMove(object sender, MouseEventArgs e)

        {

            //如果leftlag为true则进行移动

            if (!normalmoving) return;

            if (e.Button == MouseButtons.Left && normalmoving)

            {

                Point newposition = new Point(e.Location.X - oldMousePosition.X, e.Location.Y - oldMousePosition.Y);

                this.Location += new Size(newposition);

                //if (MousePosition.Y <= 0)

                //{

                //    this.WindowState = FormWindowState.Maximized;

                //    maxmoving = false;

                //}

            }

        }

        private void pnlTitle_MouseUp(object sender, MouseEventArgs e)

        {

            if (normalmoving)

            {

                normalmoving = false;

            }

        }

        #endregion

    }