Maskedtextbox validatingtype

In this case we need a "global" error checker to detect data conversion errors.From inside the Form Designer, you should see a very small triangle at the upper right-hand corner of the Data Grid View control. For example, if the Units On Hand column can never be a negative number,you could write a validating rule that looks to see if the value is negative prior to committing the changes to that row.



My guess would be that rectangular tooltips are more often used for supplemental information whereas balloons with an arrow indicate information directly related to a field or value. The Data Grid View is a very powerful windows form control for providing a user interface to tabular data.


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