Questions on UI for WinForms Forum

0 answers

4 views

Hi, I have a requirement to have multiple icons in a cell, I have created a custom GridViewDataColumn and a GridDataCellElement

My current implementation has 2 issues, the icons don't appear until you enter or leave a row (in which case only those rows icons get displayed), or when you click on the column (in which case all the visible rows display their icons.

The second issue is that, since I can scroll horizontally, when scrolling right, the cell locations that end up under the location of my icons cells, when you scroll left again, they appear empty, and you need to reload the Datasource or scroll multiple times vertically for them to appear again.

What I'm doing right now is overriding the ArrangeOverride, to locate the icons on the cell with Children[i].Arrange, and creating the icons overriding SetContent and OnCellFormatting and creating LightVisualElements there, calling Children.Clear() at the beginning of the methods.

I'll try to post an example later but has anyone had an issue like this before?

GridView

asked on 10 Mar 2026

1 answer

30 views

[Solved] Seeking Help: RadGridView Hierarchical CRUD Example with DataTable and SQLite

Hi everyone,
Requirement: Implement hierarchical (master-detail) add, delete, and edit functionality in RadGridView, with data flow: GridView ↔ DataTable ↔ SQLite Database.
Data Structure:
Master Table: MasterDataTable (e.g., Orders)
Detail Table: DetailDataTable (e.g., Order Items)
Relationship: One-to-many via foreign key
Tech Stack:
UI Control: Telerik RadGridView (WinForms)
Data Layer: DataTable + DataRelation
Database: SQLite
Core Requirements: Looking for a simple, complete example demonstrating:
1. Binding hierarchical data to RadGridView (master rows expandable to show details)
2. Two-way synchronization between UI edits and DataTable (inserts, updates, deletes)
3. Batch commit changes from DataTable back to SQLite database
Any guidance or code samples would be greatly appreciated!
Thanks in advance!

GridView

answered on 27 Feb 2026

1 answer

42 views

RadGridView Refresh

I have what seems like a simple task.

My grid looks like this:

and I create it by pulling the data and passing it to the SetupGrid() method (partially) shown below which creates the columns and sets the DataSource. This part works fine.

        private void SetupGrid(RadGridView grid,
                                List<Dictionary>? dictionaryList,
                                List<CreditInquirySetupEF>? efList,
                                List<CreditInquirySetupTU>? tuList)
        {
            grid.Columns.Clear();
            grid.Rows.Clear();
            grid.Templates.Clear();

            grid.MasterTemplate.AutoGenerateColumns = true;
            grid.MasterTemplate.ReadOnly = true;
            grid.MasterTemplate.ShowChildViewCaptions = false;
            grid.MasterTemplate.ShowRowHeaderColumn = false;

            grid.ShowRowHeaderColumn = false;
            grid.ShowChildViewCaptions = false;

            GridViewTemplate template1 = new GridViewTemplate();
            GridViewTemplate templateApp = new GridViewTemplate();

            if (efList is not null)
            {
                template1.AutoGenerateColumns = false;
                template1.DataSource = null;
                template1.DataSource = efList;
                template1.AllowAddNewRow = false;
                template1.ReadOnly = true;
                template1.ShowRowHeaderColumn = false;
                template1.Caption = string.Empty;

                grid.MasterTemplate.Templates.Add(template1);

                template1.MasterTemplate.ShowChildViewCaptions = false;

                GridViewRelation relation1 = new GridViewRelation(grid.MasterTemplate);
                relation1.ChildTemplate = template1;
                relation1.RelationName = "EQVendorID";
                relation1.ParentColumnNames.Add("DictionaryKey");
                relation1.ChildColumnNames.Add("VendorID");
                grid.Relations.Add(relation1);
            }

            if (tuList is not null)
            {
                templateApp.AutoGenerateColumns = false;
                templateApp.DataSource = null;
                templateApp.DataSource = tuList;
                templateApp.AllowAddNewRow = false;
                templateApp.ReadOnly = true;
                templateApp.ShowRowHeaderColumn = false;
                templateApp.ShowChildViewCaptions = false;
                grid.MasterTemplate.Templates.Add(templateApp);

                GridViewRelation relationApp = new GridViewRelation(grid.MasterTemplate);
                relationApp.ChildTemplate = templateApp;
                relationApp.RelationName = "TUVendorID";
                relationApp.ParentColumnNames.Add("DictionaryKey");
                relationApp.ChildColumnNames.Add("VendorID");
                grid.Relations.Add(relationApp);
            }

            grid.DataSource = null;
            grid.DataSource = dictionaryList;

            grid.MasterTemplate.Columns["BranchID"].IsVisible = false;
            grid.MasterTemplate.Columns["DictionaryID"].IsVisible = false;
            grid.MasterTemplate.Columns["DictionaryKey"].IsVisible = false;
            grid.MasterTemplate.Columns["DictionaryKeyString"].IsVisible = false;
            grid.MasterTemplate.Columns["DictionaryTypeID"].IsVisible = false;
            grid.MasterTemplate.Columns["Active"].IsVisible = false;

            grid.MasterTemplate.Columns["Description"].Width = 300;
            grid.MasterTemplate.Columns["Description"].HeaderText = "Bureau Name";
            grid.MasterTemplate.Columns["Description"].HeaderTextAlignment = ContentAlignment.MiddleLeft;

            var buttonCol = new GridViewImageColumn();

            buttonCol = new GridViewImageColumn();
            buttonCol.HeaderText = "";
            buttonCol.Name = "Propertys";
            buttonCol.HeaderImage = VisionUI.Properties.Resources.Plus_13;
            buttonCol.Width = 30;
            buttonCol.AllowSort = false;

            grid.MasterTemplate.Columns.Add(buttonCol);


            if (efList is not null)
            {
                grid.MasterTemplate.Templates[0].Caption = "";

                var column = new GridViewTextBoxColumn();

                column.FieldName = "VendorID";
                column.Name = "VendorID";
                column.IsVisible = false;
                grid.MasterTemplate.Templates[0].Columns.Add(column);


                column = new GridViewTextBoxColumn();

                column.FieldName = "SettingsBranchID";
                column.Name = "SettingsBranchID";
                column.IsVisible = false;
                grid.MasterTemplate.Templates[0].Columns.Add(column);


                column = new GridViewTextBoxColumn();

                column.FieldName = "ServiceName";
                column.Name = "ServiceName";
                column.Width = 145;
                column.HeaderText = "Service Name";
                column.HeaderTextAlignment = ContentAlignment.MiddleLeft;
                column.TextAlignment = ContentAlignment.MiddleLeft;
                column.IsVisible = true;
                grid.MasterTemplate.Templates[0].Columns.Add(column);

The problem comes when I delete a row in the subgrid and physically removing it from the db table. I tried removing the deleted entry from the collection and refreshing and even pulling the data from the database again like this:

               int settingsBranchID = absUIControls.GetGridValueInt(gvServiceNames, "SettingsBranchID");

               await creditInquirySetupEF.DeleteServiceNameAsync(settingsBranchID);
               await creditInquirySetupTU.DeleteServiceNameAsync(settingsBranchID);

               vendorList = CommonServices.GetDictionary(EDictionaryType.CreditInquiryVendor, creditInquirySetupEF.BranchID, false);

               creditInquirySetupEFList = await creditInquirySetupEF.GetCreditInquirySetupEFAsync(creditInquirySetupEF.BranchID);
               creditInquirySetupTUList = await creditInquirySetupTU.GetCreditInquirySetupTUAsync(creditInquirySetupTU.BranchID);

               gvServiceNames.DataSource = null;
               gvServiceNames.Templates[0].DataSource = null;
               gvServiceNames.Templates[1].DataSource = null;

               gvServiceNames.DataSource = vendorList;
               gvServiceNames.Templates[0].DataSource = creditInquirySetupEFList;
               gvServiceNames.Templates[1].DataSource = creditInquirySetupTUList;

               gvServiceNames.Refresh();
               gvServiceNames.Templates[0].Refresh();
               gvServiceNames.Templates[1].Refresh();


               foreach (var item in gvServiceNames.Rows)
               {
                   item.IsExpanded = true;
               }

               gvServiceNames.Templates[0].Rows[0].IsSelected = true;

When I reassign the datasources, for some reason the top grid formats like this:

Any ideas as to why?

Thanks

Carl

GridView

answered on 11 Feb 2026

1 answer

38 views

Version Upgrade Issue

private void radGridView1_ContextMenuOpening(object sender, ContextMenuOpeningEventArgs e)
{
    var cellElement = e.ContextMenuProvider as GridCellElement;
    if (cellElement == null) return;
    if (cellElement is GridHeaderCellElement)
    {
      RadMenuItem exportExcel = new RadMenuItem($"ExportToExcel");
      exportExcel.Click += (s, args) => { ExportToExcel(); };
      e.ContextMenu.Items.Add(exportExcel);
    }
}
After upgrade to UI.for.WinForms.AllControls.Net80 <Version>2025.4.1321
cellElement is null in the above line 
then return 
i can not see "RadMenuItem($"ExportToExcel")"
WHY？

GridView

updated answer on 04 Feb 2026

1 answer

35 views

GridView Rows Selection

Hello.

I'm currently using VS2019, Telerik version 2021.3.914.40.

When I Shift-click and then MouseDown on a row in radGridView,

the last clicked RowIndex is internally saved.

When I Shift + MouseDown, the last clicked RowIndex is set as the StartIndex, and the last clicked RowIndex is set as the EndIndex.

I'd like to reset this internal RowIndex, which is saved by the last click.

Since GridView.ClearSelection() doesn't handle this code, I've attached the relevant project. Please check.

GridView

answered on 03 Feb 2026

1 answer

31 views

Eliminate tab headers on subgrid

I'm trying to eliminate the tab that says table on the subgrids below. I've tried

template1.ShowChildViewCaptions = false;

template1.MasterTemplate.ShowChildViewCaptions = false;

grid.ShowChildViewCaptions = false;

grid.MasterTemplate.ShowChildViewCaptions = false;

Nothing works. What am I doing wrong?

Thanks

Carl

GridView

answered on 30 Jan 2026

1 answer

33 views

Using Be in client-server mode

Hello,
Currently using L4G (Version 11.7) in client mode (WebClient V11 on the PC)-server with a Pasoe configuration on the Linux server (where OpenEdge (DLC), PasOE, databases, and the _DB-REQUIRED program tree are located).
I need to migrate to version 12.2 + Telerik screen.
Do you have an example of a simple grid screen with CRUD management on a Be in client-server mode?
- Read the table: READ
- Create a record: CREATE
- Modify the table: UPDATE
- Delete a record: DELETE
Thank you

GridView

answered on 28 Jan 2026

2 answers

32 views

RADGRIDVIEW Performance Issue ?

i have a Master-Detail CRUD Job

Details shown using RADGRIDVIEW

for example : Master is "TBSYUSER" class Detail is "TBSYUSAU" class

change master will change detail data

i using BindingList<TBSYUSAU> --> BindingSource -> RADGRIDVIEW

now if detail data's count varing a little large

ex: record count change from 1 to 89 due to master change

RADGRIDVIEW refresh will take more times

should i change strucuture to : Datatable --> BindingSource -> RADGRIDVIEW

or have some suggestion ?

TKs

GridView

answered on 22 Jan 2026

1 answer

23 views

How to programmatically expand a GridViewComboBoxColumn

I would like to expand a GridViewComboBoxColumn list on the same row where on another column that is set to "Lost".

(see attached screenshot)
(1) User clicks on a cell and selects "Lost" from a list

(2) From Cell Event, the "Reason" column (GridViewComboBoxColumn) is automatically expanded so the user knows to select a reason.

		private void dgvSales_CellValidating(object sender, CellValidatingEventArgs e)
		{
			if(e.ColumnIndex >= 0 && e.RowIndex >= 0)
			{

				switch (e.ColumnIndex)
				{
					case int _ when e.ColumnIndex == dgvSales.Columns["colWonLost"].Index:
						if(e.Value.ToString() == "Lost")
						{
							dgvSales.CurrentRow.Cells["colReason"].IsSelected = true;
							
							//Add code here to expand colReason list


							return;
						}
						break;
					default:
						break;
				}
			}

		}  //dgvSales CellValidating