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Rowvalidating example

From Visual Studio, all you'd have to do is add the MDB file to the project and it will automatically launch the Data Source Conversion Wizard. You can perform most of these tweaks by either using the designer or via code. Padding = p ' set the monetary string format style.At the conclusion of this wizard, you'll have a strongly-typed dataset, a Table Adapter, and Data Table added to your project. Products) End Sub ' ' Save the changes you've made via the Data Grid View back to the ' underlying database ' Private Sub bn Update_Click(By Val sender As System. Let's look at how you could perform some simple tweaks in a column that contains a Money field. Format = "$#.00" ' apply the style to the column Data Grid View1. Default Cell Style = style The major technique for detected errors in a Data Grid View is by the Row Validating event.It also implements the properties that will be required later on by the Masked Text Box control, namely the Mask, Prompt Char, and Validating Type properties.Public Class Data Grid View Masked Edit Column Inherits Data Grid View Column Private p Prompt Char As Char = "_"c Private p Validating Type As Type = Get Type(String) Private p Mask As String = "" Public Sub New() My Base. Prompt Char End Sub Public Overrides Read Only Property Edit Type() As Type Get ' Return the type of the editing control that Masked Edit Editing Control uses.Click on this triangle to select the data source that was created for you when you ran the Data Source Conversion Wizard. You can use the Error Provider class to display the problems detected during validation.

From inside the Form Designer, you should see a very small triangle at the upper right-hand corner of the Data Grid View control. For example, if the Units On Hand column can never be a negative number,you could write a validating rule that looks to see if the value is negative prior to committing the changes to that row.

The remaining overrides are to adjust to the fact that the Masked Text Box control supports multiple "validating types". Editing Control Formatted Value Get Return Me.value Is Changed. End Sub Public Read Only Property Reposition Editing Control On Value Change() As Boolean _ Implements IData Grid View Editing Control.

Public Class Data Grid View Masked Edit Cell Inherits Data Grid View Text Box Cell Dim p Column As Data Grid View Masked Edit Column Public Sub New() End Sub Public Overrides Sub Initialize Editing Control(By Val row Index As Integer, By Val _ initial Formatted Value As Object, By Val data Grid View Cell Style As Data Grid View Cell Style) My Base. To String End Get Set(By Val value As Object) If Type Of value Is [String] Then Me. To String End If End Set End Property Public Function Get Editing Control Formatted Value(By Val context As _ Data Grid View Data Error Contexts) As Object Implements _ IData Grid View Editing Control. Text End Function Public Sub Apply Cell Style To Editing Control(By Val data Grid View Cell Style As _ Data Grid View Cell Style) Implements _ IData Grid View Editing Control. Reposition Editing Control On Value Change Get Return False End Get End Property Public Property Editing Control Data Grid View() As Data Grid View Implements _ IData Grid View Editing Control.

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.

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However, you'll need to add a button and one line of code to be able to save changes back to the database. Load 'TODO: This line of code loads data into the 'North Wind Data Set. If the user hovers over the red "eye ball" (it kinda looks like a lower-case "i") they will see the reason why the input was rejected. Cancel" method with some caution, as it will "lock down" the Data Grid View control, and not let the user move to any other row (or switch to any other control) until after the error is fixed.

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