Way to speed this up? Adding custom UserControl to Controls Collection

Using C# while writing a Windows Form application.


I have a "main" UserControl which I intend to use for showing a collection of other UserControls.

Right now I am keeping it simple and just hard-coding the adding of the usercontrols to the "main" usercontrol.

I added 300 of the controls and they seemed to add okay.

But when I scroll the window for the "main" control there is a bunch of ... lag?  ... as i scroll.  The mouse pointer begins to move in slow motion.  My guess is that it is related to the "main" control re-drawing itself.  Once that process finishes, the mouse speed goes back to normal.

Tips?  Tricks?

I cannot believe that I am taxing the operating system THAT MUCH with my simple controls.  We're talking about bunch of textboxes, for crying out loud.

DataGridViews can have a lot more data and they scroll with no lag.  So what am i doing that is so different?

Frustrated that I am having to put up with this!  C# and Window Forms development has been around for a while.



code for adding my user controls to the "MAIN" control:

using System.Data;
using System.Windows.Forms;

namespace DocumentController
{
    public partial class InMemoryGrid : UserControl
    {
        public InMemoryGrid()
        {
            InitializeComponent();


            InMemoryRow imr;

            InMemoryCell imc;

            UniversalDataClass udc;

            int top = 0;

            for(int i = 0; i < 300; i++)
            {
                imr = new InMemoryRow();

                for(int j = 0; j < 10; j++)
                {
                    imc = new InMemoryCell();
                    udc = new UniversalDataClass() { RawObject = "Hello" };
                    imr.AddInMemoryControl(imc);

                    imr.Top = top;
                    imc.ShowOnly(WhichControl.textbox);
                    imc.SetValue(WhichControl.textbox, udc);
                }

                Controls.Add(imr);
                top += 50;
            }

           


        }

        public GlobalSpreadsheetRAWDataHelper gs { get; set; }

       
    }
}

Select allOpen in new window

code for the InMemoryRow usercontrol:

using System.Windows.Forms;

namespace DocumentController
{
    public partial class InMemoryRow : UserControl
    {
        public InMemoryRow()
        {
            InitializeComponent();
        }


        public void AddInMemoryControl(Control c)
        {
            this.SuspendLayout();
            tableLayoutPanelRow.SuspendLayout();
            tableLayoutPanelRow.Height = c.Height;
            this.Height = tableLayoutPanelRow.Height;
            tableLayoutPanelRow.Controls.Add(c);
            tableLayoutPanelRow.ColumnCount++;
            tableLayoutPanelRow.ResumeLayout();
            this.ResumeLayout();
        }
    }
}

Select allOpen in new window

Code for the InMrmoryCell:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace DocumentController
{
    public enum WhichControl
    {
        textbox,
        combobox,
        checkbox,
        datetimepicker
    }
    public partial class InMemoryCell : UserControl
    {
        public InMemoryCell()
        {
            InitializeComponent();
        }

        public void ShowOnly(WhichControl wc)
        {
            this.SuspendLayout();
            textBoxERP.Visible = false;
            comboBoxERP.Visible = false;
            checkBoxERP.Visible = false;
            dateTimePickerERP.Visible = false;

            switch(wc)
            {
                case WhichControl.textbox:
                    textBoxERP.Visible = true;
                    break;
                case WhichControl.combobox:
                   comboBoxERP.Visible = true;
                    break;
                case WhichControl.checkbox:
                    checkBoxERP.Visible = true;
                    break;
                case WhichControl.datetimepicker:
                    dateTimePickerERP.Visible = true;
                    break;
                default:
            break;
            }

            this.ResumeLayout();
            
        }

        public void SetValue(WhichControl wc, UniversalDataClass udc)
        {
            this.SuspendLayout();
            switch(wc)
            {
                case WhichControl.textbox:
                    this.Height = textBoxERP.Height;
                    this.Width = textBoxERP.Width;
                    textBoxERP.Text = udc.AsTrimmedString;
                   // textBoxERP.Dock = DockStyle.Fill;                    
                    break;
                case WhichControl.combobox:
                    comboBoxERP.Visible = true;
                    break;
                case WhichControl.checkbox:
                    checkBoxERP.Visible = true;
                    break;
                case WhichControl.datetimepicker:
                    dateTimePickerERP.Visible = true;
                    break;
                default:
                    break;
            }
            this.ResumeLayout();
        }
    }
}

Select allOpen in new window