form.show problem

[King Abadon]

i have to make a pocket aplication
i read from an xml file and i modify some data

private void button1_Click(object sender, EventArgs e)
{
System.Data.DataSet DSet = new DataSet();
DSet.ReadXml("Employee.xml");
dataGrid1.DataSource = DSet.Tables[0];
}
private void button2_Click(object sender, EventArgs e)
{
Form1 Form2 = new Form1();
Form2.Show();//using ShowDialog is teh same
Form2.Activate();

the problem is i cant switch to form2 where i have a textbox and a buton
and if you can please tell me how i can insert the value in the dataset


Sr for so many questions but i'm a rookie with C#