Rowvalidating cancel

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We are going through the following C# code to analyze the process of validating data in grid cell.

The C# code snippet will enable the data cell validation in a textbox column for entering only none empty strings, which will disable the data validation and display the error indicator at the row header.

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.

Validating Type = Get Type(Integer) dgv Masked Edit. Data Property Name = "Units In Stock" ' some more tweaking dgv Masked Edit. Automatic ' insert the new column at the same location Data Grid View1. Insert(index, dgv Masked Edit) Now the user will only be able to type numbers into this column.

The source code for the custom Data Grid View Masked Edit Column is found below.

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Value Member = "Category ID" ' the numeric value to look up in the "child" table dgvc.Display Member = "Category Name" ' the column value you want displayed dgvc. Get Data() ' the child table ' some more tweaking dgvc. Automatic ' insert the new column at the same location Data Grid View1. Insert(index, dgvc)) Now the user can select the user-friendly Category strings and also is prevented from selecting a value that's not a valid Category ID If the 5 built-in column types is not sufficient, it is fairly easy to add a custom column type yourself.For example, you could create a new column type that supports the Masked Edit feature found in the Masked Text Box control.Below is an example of the automatically generated form Load Event and the manually-created Update button event handler for saving the data: Private Sub fm Main_Load(By Val sender As System. The Row Validating event and Error Provider may not be able to detect all errors.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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