Datagridview rowvalidating event example
Dim index As Integer ' find the location of the column index = Data Grid View1. Name = "Category" ' the column name (and heading) dgvc.Data Property Name = "Category ID" ' the matching column from the "base" table dgvc.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.I am manually handling the Datasource Update which is dependant on the validations. Example: I have both a "Company" column and a "Division" Column.Both columns may have a valid entry for each independent cell but there are only certain valid "Divisions" for a given "Company".
The problem, if the user inputs an invlaid Product ID, Cell Validating Fires and prevents the user from navagating away and clicking the Button which would display the valid options to select from. Note-I'm using a second datagridview instead of a combobox column in my initial DGV because i what to provide more information for the user to have availble like description, price, Onhand qty, etc..' ' 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).' Private Sub Data Grid View1_Row Validating(By Val sender As Object, By Val e As _ System. Row Validating ' Assume that text input is complete when you attempt to navigate ' away from the row Data Grid View1. In this case we're just checking to ' see if the Unit Price is a positive number If Data Grid View1. Luckily, the Data Grid View Combo Box Column control was designed to help solve this problem.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.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.