Gets or sets the starting point of text selected in the text box.
[Visual Basic] Public Property SelectionStart As Integer [C#] public int SelectionStart {get; set;} [C++] public: __property int get_SelectionStart(); public: __property void set_SelectionStart(int); [JScript] public function get SelectionStart() : int; public function set SelectionStart(int);
The starting position of selected selected in the text box.
If no text is selected in the control, this property indicates the insertion point for new text. If you set this property to a location beyond the length of the text in the control, the selection start position will be placed after the last character. When text is selected in the text box control, changing this property will reset the SelectionLength property to zero.
The following example uses TextBox, a derived class. It provides System.WinForms.MenuItem.Click event-handling methods for MenuItem objects that perform Cut, Copy, Paste, and Undo operations. This example assumes that a TextBox control named Text1 has been created.
[Visual Basic]
Private Sub Menu_Copy(ByVal sender As System.Object, ByVal e As System.EventArgs) ' Ensure that text is selected in the text box. If Text1.SelectionLength > 0 Then ' Copy the selected text to the Clipboard. Text1.Copy End If End Sub Private Sub Menu_Cut(ByVal sender As System.Object, ByVal e As System.EventArgs) ' Ensure that text is currently selected in the text box. If Not Text1.SelectedText = "" Then ' Cut the currently selected text to in text box to Clipboard. Text1.Cut End If End Sub Private Sub Menu_Paste(ByVal sender As System.Object, ByVal e As System.EventArgs) ' Determine if there is any text in the Clipboard to paste into the text box. If Clipboard.GetDataObject.GetDataPresent(DataFormats.CF_STRINGCLASS) = True Then ' Determine if any text is selected in the text box. If Text1.SelectionLength > 0 Then ' Ask user if they want to paste over currently selected text. If MessageBox.Show("Do you want to paste over current selection?", "Cut Example", MessageBox.YesNo) = System.WinForms.DialogResult.No Then ' Move selection to the point after the current selection and paste. Text1.SelectionStart = Text1.SelectionStart + Text1.SelectionLength End If End If ' Paste current text in Clipboard into text box. Text1.Paste End If End Sub Private Sub Menu_Undo(ByVal sender As System.Object, ByVal e As System.EventArgs) ' Determine if we can undo last operation in text box. If Text1.CanUndo = True Then ' Undo the last operation. Text1.Undo ' Clear the undo buffer to prevent last action from being redone. Text1.ClearUndo End If End Sub
TextBoxBase Class | TextBoxBase Members | System.WinForms Namespace