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      How to: Assign Different Column Editors for Different Rows
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      How to: Specify an Editor for a Column
      How to: Specify Different In-place Editors to Use in Display and Edit Modes
      How to: Validate Data Entered by End-Users
      How to: Validate Modified Rows
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View this topic on docs.devexpress.com (Learn more)

How to: Validate Modified Rows

Assume that a Grid View contains two columns: "Units In Stock" and "Units On Order". A value in the first column must be more than the value of the second one. So we need to perform validation of a row when it is about to be saved to the data source. For this purpose, the ColumnView.ValidateRow event is handled.

If row fails validation, we set errors for the columns with coresponding descriptions using the ColumnView.SetColumnError method. The descriptions will be displayed when hovering over error icons.

The ColumnView.InvalidRowException event is handled in order to suppress displaying the default error message box.

The following screenshot shows a Grid View after a row fails validation.

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