TextBoxBase.Copy Method ()


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Copies the current selection in the text box to the Clipboard.

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

[UIPermissionAttribute(SecurityAction.Demand, Clipboard = UIPermissionClipboard.OwnClipboard)]
public void Copy()

You can use this method, instead of using the Clipboard class, to copy text in the text box and place it in the Clipboard.

The following code example uses TextBox, a derived class. It provides Click event handlers for MenuItem objects that perform Cut, Copy, Paste, and Undo operations. This example requires that a TextBox control named textBox1 has been created.

private void Menu_Copy(System.Object sender, System.EventArgs e)
    // Ensure that text is selected in the text box.   
    if(textBox1.SelectionLength > 0)
        // Copy the selected text to the Clipboard.

 private void Menu_Cut(System.Object sender, System.EventArgs e)
     // Ensure that text is currently selected in the text box.   
     if(textBox1.SelectedText != "")
        // Cut the selected text in the control and paste it into the Clipboard.

 private void Menu_Paste(System.Object sender, System.EventArgs e)
    // Determine if there is any text in the Clipboard to paste into the text box.
    if(Clipboard.GetDataObject().GetDataPresent(DataFormats.Text) == true)
        // Determine if any text is selected in the text box.
        if(textBox1.SelectionLength > 0)
          // Ask user if they want to paste over currently selected text.
          if(MessageBox.Show("Do you want to paste over current selection?", "Cut Example", MessageBoxButtons.YesNo) == DialogResult.No)
             // Move selection to the point after the current selection and paste.
             textBox1.SelectionStart = textBox1.SelectionStart + textBox1.SelectionLength;
        // Paste current text in Clipboard into text box.

 private void Menu_Undo(System.Object sender, System.EventArgs e)
    // Determine if last operation can be undone in text box.   
    if(textBox1.CanUndo == true)
       // Undo the last operation.
       // Clear the undo buffer to prevent last action from being redone.

.NET Framework
Available since 1.1
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