and specify validation rules. This article talks about data annotations, why they are useful, and how to use them in our .NET Core applications. To work with the code examples provided in this ...

Use Excel data validation to prevent duplicate values in a column Your email has been sent Prevent duplicates before they happen by combining a simple function with data validation. Excel has ...

Here's a look at how to use Microsoft Excel's data validation feature to create handy lists within your worksheets. An Excel drop-down list can make it easier for the average Microsoft Excel user ...

Follow the steps below to create a drop-down list using data validation in Excel. If you want to add a message pop up, you can click the Input Message tab and check the checkbox for “Show input ...

If you’re using data annotations to enforce validation rules, you would typically decorate your classes using attributes as shown below. public class Author { [Required(ErrorMessage = "FirstName ...

Q: I have an Excel spreadsheet that I update weekly with our employees’ Actual Sales and Sales Goals. I manually insert a red circle to indicate those who did not reach their sales goal by more than a ...

This is a good case for using data validation in cell B9 to create a drop-down list of the available game numbers. My preferred way to do this for a header row in an Excel table is to first select ...

Instead of reviewing the data manually, you can use the built-in tool to get the job done. Data validation is like setting ...

The feature-rich XML support in .NET Framework 2.0 means you can perform XML data validation against a Document Type Definition (DTD) or an XML schema. You specify the validation settings as well as a ...