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This new custom column type would be very useful when trying to prevent input errors.Let's see what's required to implement a custom column control.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.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.Afterwards, you should have a fully-functional program that will allow you to view the data in the Data Table. When an input error occurs, there will be a little red exclamation point at that cell location.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.Net Regular Expressions Remove HTML Tags from String using . NET Regular Expression to Check MAC Address Regular Expression to Check Zip Code Validate e Mail Addresses using VB. The Data Grid View is a very powerful windows form control for providing a user interface to tabular data.

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.

Using the Mask property, you can specify the following input without writing any custom validation logic in your application: control is displayed at run time, it represents the mask as a series of prompt characters and optional literal characters.

NET Tips and Tricks, C# Tips & Tricks, Visual Studio 2010, . NET Tips & Tricks The Masked Text Box class is an enhanced Text Box control that supports a declarative syntax for accepting or rejecting user input.

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.

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.

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