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Pesquisa em gridview com paginação

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Tenho uma gridview com paginação (de momento tem 9paginas). quando aplico um filtro à grid, e o resultado aparece em mais que uma página, quando vou para mudar para a página 2, o filtro deixa de ser aplicado e aparecem todos os resultados (as 9 paginas).

O meu código está assim:

 protected void SearchButton_Click(object sender, EventArgs e)
        string phone_search = TextBox_phone.Text;


        Npgsql.NpgsqlCommand comm = new Npgsql.NpgsqlCommand();
        comm.CommandText = " SELECT * FROM phone_book where LOWER(name_user) like '%" + phone_search + "%' OR UPPER(name_user) like '%" + phone_search + "%' OR name_user like '%" + phone_search + "%' OR phone_number like '%" + phone_search + "%'";
        comm.Connection = DataBase.Conn;

        Npgsql.NpgsqlDataAdapter myDataAdapter = new Npgsql.NpgsqlDataAdapter();
        myDataAdapter.SelectCommand = comm;
        DataSet myDataSet = new DataSet();
        int search_exist = myDataAdapter.Fill(myDataSet);

        GridView_phone.DataSource = myDataSet;



 protected void grdData_PageIndexChanging(object sender, GridViewPageEventArgs e)
        GridView_phone.PageIndex = e.NewPageIndex;
<asp:GridView ID="GridView_phone" runat="server" AutoGenerateColumns="False"  
                            HorizontalAlign="Center" AllowPaging="True" EmptyDataText="No data" 
                            ShowFooter="False" ShowHeaderWhenEmpty="True" 
                            OnPageIndexChanging="grdData_PageIndexChanging" Font-Size="Large">
                                <asp:TemplateField HeaderText="Name">
                                        <asp:Label ID="Label1" runat="server" Text='<%# Eval("name_user") %>'></asp:Label>
                                <asp:TemplateField HeaderText="Extension">
                                        <asp:Label ID="Label2" runat="server" Text='<%# Eval("phone_number") %>'></asp:Label>
                            <FooterStyle BackColor="#565656" />
                            <HeaderStyle BackColor="#565656" ForeColor="#E4E4E4" />
                            <PagerStyle BackColor="#565656" ForeColor="#E4E4E4" HorizontalAlign="Center" 
                                VerticalAlign="Middle" />

Alguem consegue ajudar? :thumbsup:

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