DataGridColumnStyle.EnterNullValue Method

Enters a DBNull.Value into the column.

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

protected internal virtual void EnterNullValue()

This method is called when the user presses ALT+0 to allow a column to enter the appropriate null value. For example, when called on a DataGridTextBoxColumn, the appropriate NullText value is inserted into the column.

The EnterNullValue has no default behavior. When inheriting from DataGridColumnStyle, override the method to enter null in a column.

The following code example shows a possible override of the EnterNullValue method.

Overrides Protected Sub EnterNullValue()
   ' Enter the NullText value into a hosted TextBox control. 
   Me.TextBox.Text = Me.NullText
End Sub

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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