' 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.
#Vb net errorprovider example code#
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. Write code mentioned below in events generated.The following code example uses the GetError method to check for an error before opening a file dialog box. it will generate validating event for textbox in code behind. from there scroll to bottom and double click on validating.
#Vb net errorprovider example windows#
Now generate Validated or Validating event for both textboxes by opening property windows of textbox and clicking on lightning icon (Events) at the top of window. I m using 2 errorproviders, one to display warning icon and other to displat tick or success icon.Īdd this namespace in code behind of form to use regex. On the form place 2 textbox and 2 errorprovider control from toolbox. Create new windows application in visual studio.Ģ. follow steps mentioned below for this example.ġ. I have used regular expression to check textbox text for numbers.įor this i have created a simple winform application with 2 textbox on windows forms. Second textbox is numeric only, user can enter only numbers in this and if anything other than number is entered, error provider will show warning icon beside textbox with tooltip containing suggestion. In first textbox i am just checking whether it's empty or not. I am using error provider control to display warning or tick icon depending on data entered in textbox so that user can find out text entered is correct or incorrect.
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