MessageBox Class

Examples

http://msdn.microsoft.com/en-us/library/aa969773(v=vs.110).aspx

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

	Member name	Description
	AbortRetryIgnore	The message box contains Abort, Retry, and Ignore buttons.
	OK	The message box contains an OK button.
	OKCancel	The message box contains OK and Cancel buttons.
	RetryCancel	The message box contains Retry and Cancel buttons.
	YesNo	The message box contains Yes and No buttons.
	YesNoCancel	The message box contains Yes, No, and Cancel buttons.

 MessageBoxIcon Enumeration

Member name	Description
	Asterisk	The message box contains a symbol consisting of a lowercase letter i in a circle.
	Error	The message box contains a symbol consisting of white X in a circle with a red background.
	Exclamation	The message box contains a symbol consisting of an exclamation point in a triangle with a yellow background.
	Hand	The message box contains a symbol consisting of a white X in a circle with a red background.
	Information	The message box contains a symbol consisting of a lowercase letter i in a circle.
	None	The message box contain no symbols.
	Question	The message box contains a symbol consisting of a question mark in a circle. The question-mark message icon is no longer recommended because it does not clearly represent a specific type of message and because the phrasing of a message as a question could apply to any message type. In addition, users can confuse the message symbol question mark with Help information. Therefore, do not use this question mark message symbol in your message boxes. The system continues to support its inclusion only for backward compatibility.
	Stop	The message box contains a symbol consisting of white X in a circle with a red background.
	Warning	The message box contains a symbol consisting of an exclamation point in a triangle with a yellow background.

 DialogResult

Member name	Description
	Abort	The dialog box return value is Abort (usually sent from a button labeled Abort).
	Cancel	The dialog box return value is Cancel (usually sent from a button labeled Cancel).
	Ignore	The dialog box return value is Ignore (usually sent from a button labeled Ignore).
	No	The dialog box return value is No (usually sent from a button labeled No).
	None	Nothing is returned from the dialog box. This means that the modal dialog continues running.
	OK	The dialog box return value is OK (usually sent from a button labeled OK).
	Retry	The dialog box return value is Retry (usually sent from a button labeled Retry).
	Yes	The dialog box return value is Yes (usually sent from a button labeled Yes).

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
                {

                }

How to: Retrieve Data from a Dialog Box

http://msdn.microsoft.com/en-us/library/bb383855(v=vs.90).aspx

Key =>

Form2 subForm = new Form2(this);
subForm.Show();

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void addItems_Click(object sender, EventArgs e)
        {
            Form2 subForm = new Form2(this);
            subForm.Show();
        }
    }




public partial class Form2 : Form
    {
        Form1 mainForm;

        public Form2(Form1 mainForm)
        {
            this.mainForm = mainForm;

            InitializeComponent();
        }

        private void okButton_Click(object sender, EventArgs e)
        {
            if (this.textBox1.Text != string.Empty)
            {

                mainForm.listBox1.Items.Clear();

                string[] stringsEntered = textBox1.Lines;

                for (int count = 0; count < stringsEntered.Length; count++)
                {

                    mainForm.listBox1.Items.Add(stringsEntered[count]);

                }

            }
            this.Close();

        }
    }

END