In employee records, order forms, project trackers, and other Excel templates, some fields should only contain predefined values, such as departments, task statuses, approval results, or product categories. If users enter these values manually, the same option can easily appear in different forms. For example, a task status might be entered as In Progress , In progress , or an abbreviated variation. This creates extra cleanup work later when the workbook is filtered, summarized, or imported into another system. Adding drop-down lists to these cells gives users a controlled set of choices and helps reduce inconsistent data at the point of entry. This article shows how to create Excel drop-down lists in C# in three common scenarios: Use fixed values as drop-down options Use a cell range in the current worksheet as the data source Use data from another worksheet as the drop-down source Install the Required Excel Library This article uses Spire.XLS for .NET to create and modify Exce...
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