MessageBox Class

Displays a message box that can contain text, buttons, and symbols that inform and instruct the user.

MessageBoxButtons.YesNo

const string message = "您想删除当前记录吗？";
                const string caption = "删除当前记录";
                var result = MessageBox.Show(message, caption, MessageBoxButtons.YesNo, MessageBoxIcon.Question);
                if (result == DialogResult.Yes)
                {
                    //delete the current record

                }

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
    const string message =
        "Are you sure that you would like to close the form?";
    const string caption = "Form Closing";
    var result = MessageBox.Show(message, caption,
                                 MessageBoxButtons.YesNo,
                                 MessageBoxIcon.Question);

    // If the no button was pressed ...
    if (result == DialogResult.No)
    {
        // cancel the closure of the form.
        e.Cancel = true;
    }
}

private void validateUserEntry()
	{

		// Checks the value of the text. 

		if(serverName.Text.Length == 0)
		{

			// Initializes the variables to pass to the MessageBox.Show method. 

			string message = "You did not enter a server name. Cancel this operation?";
                        string caption = "Error Detected in Input";
			MessageBoxButtons buttons = MessageBoxButtons.YesNo;
			DialogResult result;

			// Displays the MessageBox.

			result = MessageBox.Show(message, caption, buttons);

			if (result == System.Windows.Forms.DialogResult.Yes)
			{

				// Closes the parent form. 

				this.Close();

			}

		}

	}

// Handles the ComboBox1 DropDown event. If the user expands the
	// drop-down box, a message box will appear, recommending the
	// typical installation.
	private void ComboBox1_DropDown(object sender, System.EventArgs e)
	{
		MessageBox.Show("Typical installation is strongly recommended.",
		"Install information", MessageBoxButtons.OK,
			MessageBoxIcon.Information);
	}

MessageBoxButtons Enumeration

MessageBoxIcon Enumeration

DialogResult

if(dr == DialogResult.Cancel)
{
    e.Cancel = true;
}
else
{
    if(dr == DialogResult.Yes)
    {
         //Save the data
    }
}

DialogResult dr = MessageBox.Show("Do You Want to Save Data?", "", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Warning);

                if (dr == DialogResult.Yes)
                {
                    //e.Cancel = false ; 

                }
                else if (dr == DialogResult.Cancel)
                {
                    //e.cancel = true ;
                }
                else
                {

                }

MessageBox Class