They make use of a pattern matching system to match the input with a certain pattern of data.
Figure 1 - These objects will determine if all our data is valid or not. Clear() 'Clear Text Box Name Valid = False 'Boolean = False Else Name Valid = True 'Everything Fine End If End Sub Easy one to start with. Focus() 'Set Focus To Text Box End If End Sub Private Sub txt Email_Lost Focus(sender As Object, e As System. Lost Focus Validate Email() 'Check Email Validity End Sub The expression may look horrible to the layman's eye, but look closer. To check if the user has entered an email that actually exists, you will have to find a different way such as to send a of some sorts.
Handle the Cell Validated event to perform post validation processing.
To display the dataset column error, invoke the Set Column Error method of the Error Provider.
You can customize the Error Provider control to set the Blink Rate and Blink Style.
Meanwhile, we can use the Validate Row event in the same way to prevent the user from exiting the current row.
We are going through the following C# code to analyze the process of validating data in grid cell.
The C# code snippet will enable the data cell validation in a textbox column for entering only none empty strings, which will disable the data validation and display the error indicator at the row header.