SaveFileDialog.OverwritePrompt Property

 

Gets or sets a value indicating whether the Save As dialog box displays a warning if the user specifies a file name that already exists.

Namespace:   System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

public bool OverwritePrompt { get; set; }

Property Value

Type: System.Boolean

true if the dialog box prompts the user before overwriting an existing file if the user specifies a file name that already exists; false if the dialog box automatically overwrites the existing file without prompting the user for permission. The default value is true.

The following code example demonstrates using the RichTextBox.SaveFile and RichTextBox.LoadFile methods with streams. It also demonstrates using the FileName, DefaultExt, CreatePrompt, and OverwritePrompt members.

This is a complete example that is ready to run when you copy it to your project.

using System;
using System.Drawing;
using System.IO;
using System.Windows.Forms;

public partial class Form1: Form
{
	internal RichTextBox RichTextBox1;
	internal Button Button1;
	internal RichTextBox RichTextBox2;
	internal Button Button2;
	internal SaveFileDialog SaveFileDialog1;

	public Form1() : base()
	{   
		this.RichTextBox1 = new RichTextBox();
		this.Button1 = new Button();
		this.RichTextBox2 = new RichTextBox();
		this.Button2 = new Button();
		this.SaveFileDialog1 = new SaveFileDialog();
		this.SuspendLayout();
		this.RichTextBox1.Location = new Point(24, 64);
		this.RichTextBox1.Name = "RichTextBox1";
		this.RichTextBox1.TabIndex = 0;
		this.RichTextBox1.Text = "Type something here.";
		this.Button1.Location = new Point(96, 16);
		this.Button1.Name = "Button1";
		this.Button1.Size = new Size(96, 24);
		this.Button1.TabIndex = 1;
		this.Button1.Text = "Save To Stream";
		this.Button1.Click += new EventHandler(Button1_Click);
		this.RichTextBox2.Location = new Point(152, 64);
		this.RichTextBox2.Name = "RichTextBox2";
		this.RichTextBox2.TabIndex = 3;
		this.RichTextBox2.Text = 
            "It will be added to the stream and appear here.";
		this.Button2.Location = new Point(104, 200);
		this.Button2.Name = "Button2";
		this.Button2.Size = new Size(88, 32);
		this.Button2.TabIndex = 4;
		this.Button2.Text = "Save Stream To File";
		this.Button2.Click += new EventHandler(Button2_Click);
		this.ClientSize = new Size(292, 266);
		this.Controls.Add(this.Button2);
		this.Controls.Add(this.RichTextBox2);
		this.Controls.Add(this.Button1);
		this.Controls.Add(this.RichTextBox1);
		this.Name = "Form1";
		this.Text = "Form1";
		this.ResumeLayout(false);
	}

	public static void Main()
	{
		Application.Run(new Form1());
	}

	// Declare a new memory stream.
	MemoryStream userInput = new MemoryStream();

	// Save the content of RichTextBox1 to the memory stream, 
	// appending a LineFeed character.  
	private void Button1_Click(Object sender, EventArgs e)
	{
		RichTextBox1.SaveFile(userInput, RichTextBoxStreamType.PlainText);
		userInput.WriteByte(13);

		// Display the entire contents of the stream,
		// by setting its position to 0, to RichTextBox2.
		userInput.Position = 0;
		RichTextBox2.LoadFile(userInput, RichTextBoxStreamType.PlainText);
	}

	// Shows the use of a SaveFileDialog to save a MemoryStream to a file.
	private void Button2_Click(Object sender, EventArgs e)
	{
		// Set the properties on SaveFileDialog1 so the user is 
		// prompted to create the file if it doesn't exist 
		// or overwrite the file if it does exist.
		SaveFileDialog1.CreatePrompt = true;
		SaveFileDialog1.OverwritePrompt = true;

		// Set the file name to myText.txt, set the type filter
		// to text files, and set the initial directory to the 
        // MyDocuments folder.
		SaveFileDialog1.FileName = "myText";
        // DefaultExt is only used when "All files" is selected from 
        // the filter box and no extension is specified by the user.
		SaveFileDialog1.DefaultExt = "txt";
        SaveFileDialog1.Filter = 
            "Text files (*.txt)|*.txt|All files (*.*)|*.*";
        SaveFileDialog1.InitialDirectory = 
            Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);

		// Call ShowDialog and check for a return value of DialogResult.OK,
		// which indicates that the file was saved. 
		DialogResult result = SaveFileDialog1.ShowDialog();
		Stream fileStream;

		if (result == DialogResult.OK)
		{
            // Open the file, copy the contents of memoryStream to fileStream,
            // and close fileStream. Set the memoryStream.Position value to 0 
            // to copy the entire stream. 
            fileStream = SaveFileDialog1.OpenFile();
			userInput.Position = 0;
			userInput.WriteTo(fileStream);
			fileStream.Close();
		}
	}
}

FileIOPermission

to set the property. Associated enumeration: PermissionState.Unrestricted.

.NET Framework
Available since 1.1
Return to top
Show: