![]() ![]() = Icon.FromHandle(((Bitmap)imageList.Images).GetHicon()) If you want to change icon errorprovider c#, you can add an imagelist control to your winform, then set icon to the error provider control as the following c# code. Using c# errorprovider check if error through the Validating event handler. To clear error provider c# you can call the SetError method, then set value to null. If (string.IsNullOrEmpty(txtUsername.Text))ĮrrorProvider.SetError(txtUsername, "Please enter your user name !") ĮrrorProvider.SetError(txtUsername, null) private void txtUsername_Validating(object sender, CancelEventArgs e) MessageBox.Show(txtUsername.Text, "Message", MessageBoxButtons.OK, MessageBoxIcon.Information) Īdd the validating event handler to the TextBox allows you to check validate the TextBox control. ![]() If (ValidateChildren(ValidationConstraints.Enabled)) private void btnLogin_Click(object sender, EventArgs e) Next, add the click event handler to the Login button as the following c# code. If an error description string is specified for the control, an icon appears next to the control. ErrorProvider presents a simple mechanism for indicating to the end user that a control on a form has an error associated with it. You need to add an ErrorProvider control to your windows form application. To play the demo, you should create a new windows forms application project, next enter your project name is "ValidateDemo " and then click OK button.ĭrag the TextBox, Label and Button from your visual studio toolbox to your winform, then design a simple UI login form as shown below. Error Provider control that helps you validation data in c# winform.
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