Page index changing for double bindings

I use a gridview for two bindings in asp.net.
There are plenty of images in each of these bindings.
I want to page the gridview.
I only know how to use single BindGrid, but in my case they are double.
What code should I use in the "protected void gvImages_PageIndexChanging" method?   
   

    protected void ddlName1_SelectedIndexChanged(object sender, EventArgs e)
    {
        BindGrid1();
    }
    protected void ddlName2_SelectedIndexChanged(object sender, EventArgs e)
    {
        BindGrid2();
    }
    private void BindGrid1()
    {
        MySqlConnection con = new MySqlConnection(constr);
        MySqlCommand cmd = new MySqlCommand("SELECT * FROM rasmlar where Rasm_ID in ('" + String.Join("','", getImage_ID1().ToArray()) + "')", con);
        MySqlDataAdapter da = new MySqlDataAdapter(cmd);
        DataTable dt = new DataTable();
        da.Fill(dt);
        gvImages.DataSource = dt;
        gvImages.DataBind();
    }
    private void BindGrid2()
    {
        MySqlConnection con = new MySqlConnection(constr);
        MySqlCommand cmd = new MySqlCommand("SELECT * FROM rasmlar where Rasm_ID in ('" + String.Join("','", getImage_ID2().ToArray()) + "')", con);
        MySqlDataAdapter da = new MySqlDataAdapter(cmd);
        DataTable dt = new DataTable();
        da.Fill(dt);
        gvImages.DataSource = dt;
        gvImages.DataBind();
    }
    protected void gvImages_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
       gvImages.PageIndex = e.NewPageIndex;
      
    }