Datagridview rowvalidating e cancel

' ' Check to see if the user input meets all of the business rules before ' we move on to another row. Data Grid View Cell Cancel Event Args) Handles _ Data Grid View1. Value The error checking discussed in the previous section may not detect "data integrity errors" (those errors where the input violates a database foreign key, unique, or primary key constraint).

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You can bind a Data Table to the control so the user can easily add/delete/modify data in a database. Products) End Sub By default, the automatically generated columns may need some tweaking.

Let's say that you have a Microsoft Access database that you plan to use in your program. For example, all columns are aligned to the left and have have no formatting.

You can use a Data Grid View Combo Box Column to act a as "look up table" to show a user friendly version of the field, rather than just a numeric equivalent.

Not only does this look better, it also prevents the user from selecting a value that would violate the foreign key constraint (meaning, you can't select a numeric value that doesn't exist in the related table) Take a look at the following example that replaces a numeric "Category ID" value with the associated user-friendly "Category" string from another table (called "Categories"). Columns("Category ID")) ' remove the existing column Data Grid View1. Remove At(index) ' create a new combobox column that we use as a "lookup" Dim dgvc As New Data Grid View Combo Box Column dgvc.

To do that, I need a sample project, which demonstrates the issue.

Could you strip only a part of your code and send it as a small example to allow us looking into this issue?In order to be able to send us your project, you have to open a new support ticket.Kind regards, Martin Vasilev the Telerik team Registration for Q1 2011 What’s New Webinar Week is now open.The Data Grid View is a very powerful windows form control for providing a user interface to tabular data.It has the initial "look and feel" of an Excel spreadsheet.For example, if a user types in alpha characters (like "abc") into a numeric field, a data conversion error occurs before Row Validation.

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