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using System;
using System.IO;
using System.Windows.Forms;

// Custom Error Provider Sample
// Copyright © 2013 Cyotek. All Rights Reserved.
// http://cyotek.com/blog/creating-a-custom-errorprovider-component-for-use-with-windows-forms-applications

// If you find this component useful, attribution or donations are welcome.

namespace ErrorProviderTest
{
  public partial class TestForm : Form
  {
    #region Constructors

    public TestForm()
    {
      InitializeComponent();
    }

    #endregion

    #region Event Handlers

    private void closeButton_Click(object sender, EventArgs e)
    {
      this.Close();
    }

    private void fileNameComboBox_TextChanged(object sender, EventArgs e)
    {
      string errorText;

      errorText = !string.IsNullOrEmpty(fileNameComboBox.Text) && !File.Exists(fileNameComboBox.Text) ? "File not found" : null;

      errorProvider.SetError(fileNameComboBox, errorText);
    }

    private void integerTextBox_TextChanged(object sender, EventArgs e)
    {
      Control control;
      string errorText;
      int value;

      control = (Control)sender;
      errorText = !int.TryParse(control.Text, out value) ? "Please enter a valid integer" : null;

      errorProvider.SetError(control, errorText);
    }

    private void submitButton_Click(object sender, EventArgs e)
    {
      if (errorProvider.HasErrors)
        MessageBox.Show("Please resolve the validation errors before trying again.", this.Text, MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
    }

    #endregion
  }
}