#Vb net errorprovider example code#
The following code tests the validity of the data the user has entered if the data is invalid, the xref.SetError%2A method is called. 1,521 2 2 gold badges 23 23 silver badges 59 59 bronze badges. The first argument of the xref.SetError%2A method specifies which control to display the icon next to. If ErrorProvider1.GetError(TextBox1) = "" Thenĭim dialogResult As DialogResult = OpenFileDialog1.The second argument is the error text to display. 'If there is no error, then open the dialog box. Private Sub Button1_Click(ByVal sender As System.Object, _īyVal e As System.EventArgs) Handles Button1.Click ' to check for an error before opening the dialog box. ' This method demonstrates using the ErrorProvider.GetError method OpenFileDialog1.InitialDirectory = TextBox1.Text Private Sub TextBox1_LostFocus(ByVal sender As Object, _īyVal e As System.EventArgs) Handles TextBox1.LostFocus ' dialog's InitialDirectory property to the text in TextBox1.
' This method handles the LostFocus event for TextBox1 by setting the An appropriate error messageĭim directory As New System.IO.DirectoryInfo(TextBox1.Text)ĮrrorProvider1.SetError(TextBox1, "Please enter a directory")Ĭatch ex2 As System.IO.DirectoryNotFoundException ' a DirectoryNotFoundException is caught. ' an ArgumentException is caught if an invalid directory is entered, Private Sub TextBox1_Validating(ByVal sender As Object, _īyVal e As ) _
If (errorProvider1.GetError(textBox1)="")ĭialogResult dialogResult = openFileDialog1.ShowDialog() Private void button1_Click(System.Object sender, System.EventArgs e) OpenFileDialog1.InitialDirectory = textBox1.Text Private void textBox1_LostFocus(object sender, System.EventArgs e) dialog's InitialDirectory property to the text in textBox1. This method handles the LostFocus event for textBox1 by setting the "Try again with a different directory.") New System.IO.DirectoryInfo(textBox1.Text) ĮrrorProvider1.SetError(textBox1, "Please enter a directory") Ĭatch(System.IO.DirectoryNotFoundException ex2)ĮrrorProvider1.SetError(textBox1, "The directory does not exist." + Private void textBox1_Validating(object sender, ::DialogResult dialogResult = OpenFileDialog1->ShowDialog() If ( ErrorProvider1->GetError( TextBox1 )->Equals( "" ) ) If there is no error, then open the dialog box. Void Button1_Click( System::Object^ sender, System::EventArgs^ e )
to check for an error before opening the dialog box. This method demonstrates using the ErrorProvider.GetError method OpenFileDialog1->InitialDirectory = TextBox1->Text Void TextBox1_LostFocus( Object^ sender, System::EventArgs^ e ) dialog's InitialDirectory property to the text in TextBox1. This method handles the LostFocus event for TextBox1 by setting the "Try again with a different directory." ) System::IO::DirectoryInfo^ directory = gcnew System::IO::DirectoryInfo( TextBox1->Text ) ĮrrorProvider1->SetError( TextBox1, "" ) ĮrrorProvider1->SetError( TextBox1, "Please enter a directory" ) Ĭatch ( System::IO::DirectoryNotFoundException^ )ĮrrorProvider1->SetError( TextBox1, "The directory does not exist." a DirectoryNotFoundException is caught. an ArgumentException is caught if an invalid directory is entered, System::ComponentModel::CancelEventArgs^ e ) Void TextBox1_Validating( Object^ sender, Ensure all events are associated with their event handlers. 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. The following code example uses the GetError method to check for an error before opening a file dialog box.
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