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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

The following code example demonstrates the use of this member.


   private void RegisterEventHandlers(DataGridBoolColumn myDataGridBoolColumn)
   {
      myDataGridBoolColumn.AllowNullChanged += 
         new System.EventHandler(myDataGridBoolColumn_AllowNullChanged);
      myDataGridBoolColumn.TrueValueChanged += 
         new System.EventHandler(myDataGridBoolColumn_TrueValueChanged);
      myDataGridBoolColumn.FalseValueChanged +=
         new System.EventHandler(myDataGridBoolColumn_FalseValueChanged);
   }

   // Event handler for event when 'TrueValue' is property changed. 
   private void myDataGridBoolColumn_TrueValueChanged(object sender, EventArgs e)
   {
      MessageBox.Show("The TrueValue property of the DataGridBoolColumn has been changed to "
         + myDataGridBoolColumn.TrueValue);
   }

   // Event handler for event when 'FalseValue' is property changed. 
   private void myDataGridBoolColumn_FalseValueChanged(object sender, EventArgs e)
   {
      MessageBox.Show("The FalseValue property of the DataGridBoolColumn has been changed to "
         + myDataGridBoolColumn.FalseValue);
   }

   // Event handler for event when 'AllowNull' is property changed. 
   private void myDataGridBoolColumn_AllowNullChanged(object sender, EventArgs e)
   {
      MessageBox.Show("The AllowNull property of DataGridBoolColumn has been changed to "
         + myDataGridBoolColumn.AllowNull);
   }

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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