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When you do encounter data that is invalid you usually notify the user about it. There are many ways to do this; the conventional way is to use a message box. The DataGridview has the ability to show an error icon for the cell and rows to indicate that invalid data was entered. The error icon has a tooltip associated with it to provide informational about what is in error:

What is the DataGridView
Differences between the DataGridView and DataGrid controls
Highlight of features
Structure of DGV
Architecture Elements
Cells and Bands