![]() ![]() The source code is now available in C# (Visual Studio 2005) edition. ValidationControl class has all required properties like DisplayName, ErrorMessage, Validate, ControlObj, etc. Each control is of type ValidationControl. Since the icon and message associated with the ErrorProvider can easily be changed, I figured that would be a good way to create a 'Warning Provider'. It uses the ValidationControlCollection class which is derived from the CollectionBase class. I have always liked using the ErrorProvider as an easy way to alert the user that something is wrong. I have used an extended collection base class for ErrorProviderExtended.Controls property. MyErrorProvider.Controls(txtEmergenc圜ontact).Validate = False End If End Sub End Classĭescription of ErrorProviderExtended class is included as comments in the source code. MyErrorProvider.Controls(txtEmergenc圜ontact).Validate = True Else ' if student's age is greater than 10, emergency contact is not mandatory If chkAge.Checked Then ' if student's age is less than 10, emergency contact is mandatory Object, _īyVal e As System.EventArgs) Handles chkAge.CheckedChanged MessageBox.Show( " Data submitted successfully.")Įnd If End Sub Private Sub chkAge_CheckedChanged( ByVal sender As System. If MyErrorProvider.CheckAndShowSummaryErrorMessage = True Then Ensure all events are associated with their event handlers. ' If any mandatory field is empty this function displays a message ' and returns FALSE. To run this example, paste the following code into a form containing a TextBox named TextBox1, an OpenFileDialog named OpenFileDialog1, a button named Button1, and an ErrorProvider named ErrorProvider1. ' Following function checks all empty fields and returns TRUE ' if all fields are entered. Object, _īyVal e As System.EventArgs) Handles cmdSubmit.Click MyErrorProvider.SummaryMessage = " Following fields are mandatory," End Sub Private Sub cmdSubmit_Click( ByVal sender As System. MyErrorProvider.Controls(txtEmergenc圜ontact).Validate = False ' Set summary error message ' Initially make emergency contact field as non mandatory (txtEmergenc圜ontact, " Emergency Contact Number") ' Add controls one by one in error provider. Object, _īyVal e As System.EventArgs) Handles MyBase.Load Private Sub TestForm_Load( ByVal sender As System. dim d as double dim s as string s243,5 If Double.TryParse(s, d) Then Here we do some calculations using d Else Console.Write(Could not parse/. ' Declare a variable Dim MyErrorProvider As New ErrorProviderExtended ![]()
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