Datagridview validating event c

Next, you'll need to add a Data Grid View to a form. ' create new style object Dim style As New Data Grid View Cell Style ' set the alignment to the right (for numbers) style. Middle Right ' add a wee bit of padding to the right side Dim p As New Windows. This allows you to use a "business rule" to validate the user input.

It overrides the Initialize Editing Control method to allow the Mask, Prompt Char, and Validating Type properties from the column class to be passed onto the Cell class. Class Masked Edit Editing Control Inherits Masked Text Box Implements IData Grid View Editing Control Private data Grid View Control As Data Grid View Private value Is Changed As Boolean = False Private row Index Num As Integer Public Sub New() End Sub Public Property Editing Control Formatted Value() As Object Implements _ IData Grid View Editing Control. Prepare Editing Control For Edit ' No preparation needs to be done.New(New Data Grid View Masked Edit Cell()) End Sub Public Overrides Property Cell Template() As Data Grid View Cell Get Return My Base. Return Get Type(Masked Edit Editing Control) End Get End Property Public Overrides Read Only Property Value Type() As Type Get ' Return the type of the value that Masked Edit Editing Control contains. Validating Type End Get End Property Public Overrides Read Only Property Default New Row Value() As Object Get Return "" End Get End Property End Class Lastly, is the Editing Control. Back Color End Sub Public Property Editing Control Row Index() As Integer Implements _ IData Grid View Editing Control.Cell Template End Get Set(By Val value As Data Grid View Cell) ' Ensure that the cell used for the template is a Masked Edit Cell If Not (value Is Nothing) And Not value. Is Assignable From( _ Get Type(Data Grid View Masked Edit Cell)) Then Throw New Invalid Cast Exception("Must be a Data Grid View Masked Edit Cell") End If My Base. It inherits from the Masked Text Box control (to get the user interface we want) and implements the Editing Control interface so that the control works inside the Data Grid View. Editing Control Row Index Get Return row Index Num End Get Set(By Val value As Integer) row Index Num = value End Set End Property Public Function Editing Control Wants Input Key(By Val key As Keys, By Val _ data Grid View Wants Input Key As Boolean) As Boolean Implements _ IData Grid View Editing Control.The example below shows how you could replace an existing automatically-generated "Units In Stock" column with a new custom column that supports the Masked Edit feature. Columns("Units In Stock")) ' remove the existing column Data Grid View1. Remove At(index) ' create a new custom column Dim dgv Masked Edit As New Data Grid View Masked Edit Column dgv Masked Edit.Dim index As Integer ' find the location of the column index = Data Grid View1. Mask = "####" ' this mask will allow only numbers (max of 4) dgv Masked Edit.

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