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How to optimize ViewState generated by GridView and keep some GridView related functionalities
public void DisableViewState(GridView dg)
{
    foreach (GridViewRow gvr in dg.Rows)
    {
        gvr.EnableViewState = false;
    }
}

private void Page_Load(object sender, System.EventArgs e)
{
    if (!Page.IsPostBack)
    {
        GridView1.DataSource = GetData();
        GridView1.DataBind();
        DisableViewState(GridView1);
    }
}

<ItemTemplate>
    <asp:LinkButton CommandArgument='<%#Eval("idnumber")%>' ID="linkSelect" Text="Select"
        runat="server" OnCommand="selectCommand"></asp:LinkButton>
</ItemTemplate>

protected void selectCommand(object sender, CommandEventArgs e)
{
    int numberID = int.Parse(e.CommandArgument.ToString());
    selectCommandInfo(numberID);
}