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

Manoj Kumar Mandal · Answer

Instead of directly storing the values in gridview cell you can create a data table and store your value there and bind that data table to your grid. For asp code check this DataTable dt = null; protected void Page_Load(object sender, EventArgs e) { dt = new DataTable(); dt.Columns.Add(new DataColumn("value")); dt.Columns.Add(new DataColumn("Name")); dtTemp = dt; } protected void Button1_Click(object sender, EventArgs e) { dt = dtTemp; DataRow dr = dt.NewRow(); dr["value"] = TextBox1.Text; dr["Name"] = "name"; dt.Rows.Add(dr); GridView1.DataSource = dt; GridView1.DataBind(); dtTemp = dt; } private DataTable dtTemp { get { return (DataTable)ViewState["Parameter:dtTemp"]; } set { ViewState["Parameter:dtTemp"] = value; } }