# Delete Validation

Learn how to delete validation rule applied to a cell or a range of cells in a worksheet using DsExcel.

## Content

You can delete the applied validation rule using the [Delete method](/document-solutions/dot-net-excel-api/api/online/DS.Documents.Excel/GrapeCity.Documents.Excel.IValidation.Delete.html) of the [IValidation interface](/document-solutions/dot-net-excel-api/api/online/DS.Documents.Excel/GrapeCity.Documents.Excel.IValidation.html).
Refer to the following example code to know how you can delete validation rule applied to a cell or a range of cells in a worksheet.

```csharp
//Add validation
worksheet.Range["A1:A3"].Validation.Add(ValidationType.Whole, ValidationAlertStyle.Stop, ValidationOperator.Between, 1, 8);
worksheet.Range["B1:B3"].Validation.Add(ValidationType.Whole, ValidationAlertStyle.Stop, ValidationOperator.Between, 11, 18);

//Delete validation.
worksheet.Range["A1:A2"].Validation.Delete();
```