![]() ![]() ![]() When any value (text or number) is entered in textbox and Submit button clicked then form will execute. If textbox is empty and Submit button is clicked then error icon will display. If TextBox1.Text = "" Then ' condition is given so that empty textbox could not saveĮrrorProvider1.SetError(TextBox1, "Cannot leave textbox blank")'error text will show as tooltip Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click When an error message is set, an icon indicating the error will appear next to the control and the error message is displayed as Tool Tip when the mouse is over the control. If ErrorProvider1.GetError(TextBox1) = "" Thenĭim dialogResult As DialogResult = OpenFileDialog1.ErrorProvider allows us to set an error message for any control on the form when the input is not valid. '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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