private void button1_Click(object sender, EventArgs e)
{
if (textBox1.TextLength == 0 || comboBox1.SelectionLength == 0 || textBox2.TextLength == 0)
{
MessageBox.Show("Enter value");
return;
}
DB.addDataToApplicationsEmployee(textBox1.Text, comboBox1.Text, textBox2.Text, dateTimePicker1.Value);
loadInfoToTable();
}