Global Variable loses its value after page index changed in DataGrid

Question

My problem is losing value.I have a DataGrid with standart asp.net pagination. When I change page index, global variable named "id" loses its value. Help me Please.

int id = 0;

void Payments()
{
    radioBtnList = GetData();
    radioBtnList.DataBind();
}

protected void Page_Load(object sender, EventArgs e)
{
    Payments();
    Response.Write(id); //  I get value 0 :(
}

protected void radioBtnList_Changed(object sender, EventArgs e)
{
    id = int.Parse(radioBtnList.SelectedItem.Text);
}

protected void dgw_pagechange(object source, DataGridPageChangedEventArgs e)
{
    dgw.CurrentPageIndex = e.NewPageIndex;
    dgw.DataBind();
}

Answer 1

You can use ViewState like this.

int id = 0;
void Payments ()
{
    radioBtnList = GetData();
    radioBtnList.DataBind ();
}

protected void Page_Load (object sender, EventArgs e)
{
  Payments();
  Response.Write(ViewState["id"]);
}

protected void radioBtnList_Changed (object sender, EventArgs e)
{
   id = int.Parse (radioBtnList.SelectedItem.Text);
   ViewState["id"]=id;
}


protected void dgw_pagechange (object source, DataGridPageChangedEventArgs e)
{
    dgw.CurrentPageIndex = e.NewPageIndex;
    dgw.DataBind();
}