I'm beginner and I have small problem. I need check if it is not empty die combobox. Now when I click button and the Combobox give an null error
"An unhandled exception of type 'System.NullReferenceException' occurred in WindowsFormsApplication4.exe
Additional information: Object reference not set to an instance of an object.
private void Wykonaj_Click(object sender, EventArgs e)
{
if (Combobox1.SelectedIndex.ToString() != null)
{
if (Combobox.SelectedItem.ToString() != "Audi")
{
wersja= "110";
}
else
{
wersja = "101";
}
}
}