i think it`s better to divide ur programe.cs classes into more than DLL or u can alot of classes in one namspace ; but u can add project1 in solution and adding the project1 namespace in ur certain...

use this Empleados.numeroemp += 1;

hi
this simple example u can set data in combobox
for (int i = 0; i < 10; i++)
{
comboBox1.Items.Add(i);
}
comboBox1.SelectedIndex = 0;

plz follow the advice of "Atenka" and "Ramy...

// reading the contetnt of file
StreamReader sr = new StreamReader(Sting Path);
textbox1.text=sr.ReadToEnd();
sr.Close();

//writing to the file

StreamWriter sw = new StreamWriter(Sting...