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Cellvalidating at datagridview

For a complete explanation of this code example, see Walkthrough: Validating Data in the Windows Forms Data Grid View Control. Form Private With Events data Grid View1 As New Data Grid View() Private binding Source1 As New Binding Source() Public Sub New() ' Initialize the form. Empty End Sub Private Shared Function Get Data(By Val select Command As String) As Data Table Dim connection String As String = _ "Integrated Security=SSPI; Persist Security Info=False;" _ "Initial Catalog=Northwind; Data Source=localhost; Packet Size=4096" ' Connect to the database and fill a data table. Also see How to: Compile and Run a Complete Windows Forms Code Example Using Visual Studio.

You can validate data by handling the Cell Validating event, which is raised by the Data Grid View when the current cell changes.

In this walkthrough, you will retrieve rows from the column and tries to leave the cell, the Cell Validating event handler will examine new company name string to make sure it is not empty; if the new value is an empty string, the Data Grid View will prevent the user's cursor from leaving the cell until a non-empty string is entered.

I would like to manipulate a cell in my Data Grid View when it is validating so that if the user enters a value that is not valid for the database, but is easily converted to valid data, the program will change the value to an appropriate one.

I am able to validate my value properly but when I try to change it to something valid I get a Data Error. You should never attempt to change the cell value in the handler for this event, because unless you cancel the event (in which case the user is stuck in edit mode), the cell value is set to the value from the editing control immediately after the event finishes.

For example, for a In general, it is better to use the Cell Parsing event whenever you need to convert/change the value in a cell.

From within that event, you can indicate that the user's value is invalid by setting the Error Text value of the cell or row.

To copy the code in this topic as a single listing, see How to: Validate Data in the Windows Forms Data Grid View Control.

In order to complete this walkthrough, you will need: Data Grid View Binding Source Data Entry in the Windows Forms Data Grid View Control How to: Validate Data in the Windows Forms Data Grid View Control Walkthrough: Handling Errors that Occur During Data Entry in the Windows Forms Data Grid View Control Protecting Connection Information Note The feedback system for this content will be changing soon. If content within a comment thread is important to you, please save a copy.

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