Validating windows forms


Thankfully Win Forms has built in mechanisms to help facilitate data validation.Each control has the following events and properties that are used to validate a form. Validation on a control is triggered when the control loses focus. Cancel Event Args] object as a parameter to the event block, which you can access this by using the in the Validating event, all events that would usually occur after the Validating event are suppressed.



As for validating the text, it can range from simply ensuring there is value (i.e., not an empty string) or more complex task such as validating the format of an email address. Once you have written a validation function for a specific format, convert it into a snippet, so the next time you need to validate similar data, you will save time by simply inserting your snippet.The bad news is that you have to script your validation and it can change depending on the data type and format. Validation Example 1: Checking if a Text Box Field is Empty For the first example, we will create a simple function that will ensure the field is empty as well as making sure it doesn’t only contain blank spaces.In this example, we cancel the validation, when the field is empty or has only whitespaces.The Mask Text Box insures the field is entered correctly by enforcing formatting.

Depending on the format, you may still need custom validation for control or use the Mask Text Box’s built in validation for Date Time formats and number values.

Validating Example 2: Using Parameter Validation First, define a function that will use the function’s Parameter Validation attributes: Cannot validate argument on parameter ‘Text’.



Validating windows forms comments


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