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You will find as you tab through the textboxes on the form, that you will get the error icon appearing unless you enter data in the right format.Hovering the mouse over the error icon will tell you what is wrong and how to fix it.Data input validation in Windows Forms is essential.Built-in validation doesn't go much further than an enforcable maximum length for textboxes, but there are some nice methods you can use to make validation a breeze.When a user is tabbing fast through a dialog entering data, they are sometimes going to get it wrong. When we do get it wrong, however, we don't want to be bugged about it.The last thing we need is for a Message Box to pop up when we tab away from a field, telling us it's invalid. Also, we don't want all the validation done when the user presses the OK button, because they could then potentially be given a great big message with all the fields that are wrong.For the need of validation process we made two events (Item Validating, Item Validated) that are firing when the Validating and Validated events occur in the editors.
Then the Auto Size Columns Mode is set to the ‘Data Grid View Auto Size Columns Mode.You need to set the check boxs Three State property to True to indicate that you want it to support three states.The radio button and the check box are used for different functions.These questions have been collected from a variety of sources including some newsgroups, MSDN site and a few, answered by me at the MSDN forums.
Data Grid View control is a Windows Forms control that gives you the ability to customize and edit tabular data.
All Cells’ enumeration value which automatically adjust the widths of the columns when the data changes.