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Note that some questions are duplicated in multiple sections based upon the section relevancy.
The question and answers with code samples/snippets are contained in this documents only appendix to make for a one-stop shop of code.
Displaying a Combo Box in Cell Frequently, besides displaying text in a cell you may want to display a drop-down list box to allow users to select from a list of pre-determined values.
In this case, you need to add a Combo Box to the cells in the desired column.
Please also try not to crowd your code with explanatory comments, this reduces the readability of both the code and the explanations!
When you display data entry functionality to users, you frequently have to validate the data entered into your form.
You can validate data by handling the Cell Validating event, which is raised by the Data Grid View when the current cell changes.
Lastly, a best practice section concludes the main part of this document.
Most sections contain a Q & A section that answers common questions regarding the specific feature or area covered by the section.
column, its value is tested for validity by checking that it is not empty.
If the event handler for the Cell Validating event finds that the value is an empty string, the Data Grid View prevents the user from exiting the cell until a non-empty string is entered.