using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace CustomComponents { public partial class frameTextBox : UserControl { private string? _text; public frameTextBox() { InitializeComponent(); } public string? Value { get { return _text; } set { _text = value; } } private void CheckBoxStateChanged(object sender, EventArgs e) { if (ruleCheckBox.Checked) { textBox.Enabled = false; if (!string.IsNullOrEmpty(_text)) { MessageBox.Show("TextBox is not empty!"); } } else { textBox.Enabled = true; if (string.IsNullOrEmpty(_text)) { MessageBox.Show("TextBox is empty. You better write something!"); } } } private void CheckTextBoxValueType(object sender, EventArgs args) { Value = textBox.Text; try { Convert.ToInt32(Value); } catch (Exception ex) { MessageBox.Show(ex.ToString()); } } } }