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TextBoxBase.Modified Property

Gets or sets a value that indicates that the text box control has been modified by the user since the control was created or its contents were last set.

[Visual Basic]
Public Property Modified As Boolean
[C#]
public bool Modified {get; set;}
[C++]
public: __property bool get_Modified();
public: __property void set_Modified(bool);
[JScript]
public function get Modified() : Boolean;
public function set Modified(Boolean);

Property Value

true if the control's contents have been modified; otherwise, false. The default is false.

Remarks

You can use this property to determine if the user has modified the contents of the text box control. You can also set this property in code to indicate that changes were made to the text box control by the application. This property can be used by validation and data-saving methods to determine if changes were made in a text box control so the changed contents can be validated or saved.

Example

[Visual Basic, C#, C++] The following example uses the TextChanged event for a TextBox, a derived class, to determine if the contents of the TextBox control have changed since the control was filled with data. The example uses a string to store the original contents of the control and compares it against the contents of the TextBox to determine if the contents have changed. If the contents have changed, the Modified property is set to true. Otherwise, it is reset to false. This example assumes that a TextBox control named textBox1 has been created and that a String variable named originalText has been created to store the original text for the TextBox control.

[Visual Basic] 
Private Sub TextBox1_TextChanged(sender As Object, e As EventArgs)
    ' Check to see if the change made does not return the
    ' control to its original state. 
    If originalText <> textBox1.Text Then
        ' Set the Modified property to true to reflect the change.
        textBox1.Modified = True
        ' Contents of textBox1 have not changed, reset the Modified property.
    Else
        textBox1.Modified = False
    End If
End Sub


[C#] 
private void TextBox1_TextChanged(object sender, EventArgs e)
 {
    /* Check to see if the change made does not return the
       control to its original state. */
    if (originalText != textBox1.Text)
       // Set the Modified property to true to reflect the change.
       textBox1.Modified = true;
    else
       // Contents of textBox1 have not changed, reset the Modified property.
       textBox1.Modified = false;
 }
 

[C++] 
private:
void TextBox1_TextChanged(Object* /*sender*/, EventArgs* /*e*/)
 {
    /* Check to see if the change made does not return the
       control to its original state. */
    if (originalText != textBox1->Text)
       // Set the Modified property to true to reflect the change.
       textBox1->Modified = true;
    else
       // Contents of textBox1 have not changed, reset the Modified property.
       textBox1->Modified = false;
 }
 

[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button Language Filter in the upper-left corner of the page.

Requirements

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, .NET Compact Framework

See Also

TextBoxBase Class | TextBoxBase Members | System.Windows.Forms Namespace

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