DataGridBoolColumn::AllowNullChanged Event

 

Occurs when the AllowNull property is changed.

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

public:
event EventHandler^ AllowNullChanged {
	void add(EventHandler^ value);
	void remove(EventHandler^ value);
}

The following code example demonstrates the use of this member.

void RegisterEventHandlers( DataGridBoolColumn^ myDataGridBoolColumn )
{
   myDataGridBoolColumn->AllowNullChanged += gcnew System::EventHandler( this, &MyForm::myDataGridBoolColumn_AllowNullChanged );
   myDataGridBoolColumn->TrueValueChanged += gcnew System::EventHandler( this, &MyForm::myDataGridBoolColumn_TrueValueChanged );
   myDataGridBoolColumn->FalseValueChanged += gcnew System::EventHandler( this, &MyForm::myDataGridBoolColumn_FalseValueChanged );
}

// Event handler for event when 'TrueValue' is property changed.
void myDataGridBoolColumn_TrueValueChanged( Object^ /*sender*/, EventArgs^ /*e*/ )
{
   MessageBox::Show( String::Concat( "The TrueValue property of the DataGridBoolColumn has been changed to ", myDataGridBoolColumn->TrueValue ) );
}

// Event handler for event when 'FalseValue' is property changed.
void myDataGridBoolColumn_FalseValueChanged( Object^ /*sender*/, EventArgs^ /*e*/ )
{
   MessageBox::Show( String::Concat( "The FalseValue property of the DataGridBoolColumn has been changed to ", myDataGridBoolColumn->FalseValue ) );
}

// Event handler for event when 'AllowNull' is property changed.
void myDataGridBoolColumn_AllowNullChanged( Object^ /*sender*/, EventArgs^ /*e*/ )
{
   MessageBox::Show( String::Concat( "The AllowNull property of DataGridBoolColumn has been changed to ", myDataGridBoolColumn->AllowNull ) );
}

.NET Framework
Available since 1.1
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