How to retain form fields values when page reload?

Question

Hi,

 

 I have a form with few fields and datagrid.If I say something about datagrid there is a button "Add".When you click this it will open another
form with some values where I can select one of the value and click ok.Then selected value needs to come to datagrid.I have implement that using below method.

set {
DataGridViewRow row = (DataGridViewRow)dataGridView1.Rows[0].Clone();
row.Cells[0].Value = value;
row.Cells[1].Value = "Name";
dataGridView1.Rows.Add(row);
}

So it updates the datagrid.But after it updates I need to use

 

dataGridView1.Update();
dataGridView1.Refresh();

for show the result in datagrid.This makes my form reload and lost previously entered data.

1.How can I retain previously enter values when form reload?
2.Is there any way to update datagrid without reload?

Thanks