Questions on UI for WinForms Forum

4 answers

514 views

change grid cell color after checkbox click

I'm having difficulty understanding the flow of how these events get called and where I should modify formatting info.

The grid view events I'm working with currently are grid_CellFormatting, grid_CellBeginEdit, grid_CellEndEdit. I have a grid, that has many columns of data that are bound to a generic list of objects. These objects have bool properties I'd like to allow the user to update through a single grid with many columns/rows. The majority of the columns are GridViewCheckBoxColumn(the ones that I want to not be read-only). I'd like to allow the user to check these boxes, and it will turn the cell they are contained within to a different color. Then after they've clicked many, they can commit these changes using a save button.

I assume that I can only update the formatting of a cell in the _cellformatting event. So, I assume I need to pass some data along to this event that allows it to look at the checkbox and determine if the value is changed. I've written some code that would do this using the .Tag object on the cell. This isn't working well, and I'm looking for some advise. I can't be the first one to use a grid in this fashion. Allow users to make changes, and see those changes, and then commit all at once.

Any advice?

GridView

answered on 18 Mar 2021

2 answers

1.3K+ views

GridView performance and memory issues

1.- Issue:
I have a RadGridView consisting of one master template and a child template. I query my database, build a dataset and I assign it to the RadGridView datasource.

It works just fine with few records but when I pull a considerable amount of data it takes forever to render, specially if I want my rows to be expanded from the beginning.

For Each row As GridViewRowInfo In template.Rows
row.IsExpanded = True
Next

Is there any way to improve the render time of the RadGridView ? The query and code take around 3 seconds to run, but when I go row by row expanding all of them it just takes like 2 minutes. I am attaching what it looks like when it finished loading. The 400 row hast more than 8000 records in the child template. I know its big data, but is there any way to improve this ?

2.- Issue
As soon as the RadGridView finishes loading the data mentioned above, if I close the screen the resources are not freed at all. I tried calling RadGridView1.Dispose() but it takes more than 10 seconds to just run the dispose command. Is this a known issue that the RadGridView eats a lot of memory and can't free it by itself ?

I am running Telerik for WinForms 2020.2.616.40

Thanks for any information provided.

GridView

answered on 17 Mar 2021

3 answers

178 views

RadDesktopAlert transparent

I notice default RadDesktopAlert backcolor is transparent, when I move mouse it change to solid color without transparent, please let me know if this is possible to remove its transparent backcolor property?

Thanks,
Shakti

DesktopAlert

answered on 17 Mar 2021

1 answer

149 views

insert a logo in printed chart page

Hi

I use Telerik UI for WinForm 2014 radchart.

I need to insert a logo picture and a label involved NowDate in printed chart page.

for this goal I insert a label and picture box on radchartviewer component but when I print(radchartviewer1.Print()) neither label or logo not printed.

Please help me.

Thanks.

ChartView

answered on 17 Mar 2021

54 answers

2.4K+ views

RadGridView vs DataGridView Performance

Hi Admins

Previously i was using Default DataGridView for populating a Table.

It was working fine. But due to advace Functionality of RadGridView, I have develop the same with Telerik Controls (R2 SP1 2019).

But i have some Performance Issues.

Check the Sample Code and please suggest me for Performance Enhancement.

I'm Creating Column at Run Time Using This Code and Setting Grid Properties.

this.radGridView1.MasterTemplate.AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.Fill;

this.radGridView1.ShowGroupPanel = false;

this.radGridView1.MasterTemplate.EnableGrouping = false;

this.radGridView1.EnableHotTracking = true;

this.radGridView1.MasterTemplate.SelectionMode = GridViewSelectionMode.FullRowSelect;

this.radGridView1.AllowAddNewRow = false;

this.radGridView1.AllowEditRow = false;

GridViewTextBoxColumn ColumnId = new GridViewTextBoxColumn

{

Name = "suppid",

HeaderText = "Code",

FieldName = "suppid",

Width = 80,

HeaderTextAlignment = ContentAlignment.MiddleCenter,

TextAlignment = ContentAlignment.MiddleCenter

};

radGridView1.MasterTemplate.Columns.Add(ColumnId);

I'm creating 10 different Columns using the Above Code.

Using the Below Code loading the Data to GridView

DataTable dt = new DataTable();

string query = "Select suppid from p_supplier" ;

SqlCommand cmd = new SqlCommand(query, Conn);

SqlDataAdapter DA = new SqlDataAdapter(query, Conn);

DA.Fill(dt);

BindingSource source = new BindingSource();

source.DataSource = dt;

radGridView1.MasterTemplate.DataSource = source;

I have shown you only 1 Column only to shorten my Code.

Please Suggest.

GridView

answered on 17 Mar 2021

13 answers

1.3K+ views

RadDropDownList

hello,

I am using RadDropDownList and binding it in Code behind using a datatable. The issue is when the form loads the RadDropdownlist displays the first record in the list and this fires the selectedindexchanged.
I want the RadDropDownlist to be in the state where the user selects the item he wants from the list and then the selectedindexchanged event fires.

Any ideas?

Thanks

DropDownList

answered on 17 Mar 2021

2 answers

154 views

How to utilize launch argument in Editor

Hello,

I just recently discovered that this tool was added to the Telerik win UI toolbox and love the functionality. Within the editor it is possible to assign a launch argument value. However, after reviewing the documentation I'm not entirely sure how to go about referencing that argument within the toast template, as well as passing in the value for that argument at run time.

I've attached a screenshot of what I'm trying to accomplish within the toast notification editor. Two questions:

1) What's the correct syntax to reference the launch argument variable value within the toast notification editor?

2) Is there a method to assign the variable value prior to calling the .ShowToastNotification(index) method?

Thanks!

ToastNotificationManager

answered on 16 Mar 2021

10 answers

894 views

cell editing

Hi

I am using RadGridView. In cell edit mode of a decimal column, I do not want the incerement and decrement in cell value. So I set the Step property to 0. It is working. Now by pressing the up and down key in cell edit mode do not change the cell value. But there is a problem if cell is empty and I press up key then first time it puts some value in the cell ( I think that value is some last inserted/updated value of the grid). Can you provide some solution for that.

Also I want that in cell edit mode when user presses up and down key, it commits the cell value and cursor moves to up and down cell accordingly. How can I acheive it. Any Help would be appreciated!

Thnaks

Regards

GridView

answered on 15 Mar 2021

5 answers

326 views

Custom zoom

Hello,

my task was to enable zoom of GridView using mouse wheel + Ctrl key. I implemented it with partial success. I am not able to correctly resize some parts of the grid - see attached pic with red rectangles. I can provide a sample project. And a subquestion - is it possible to disable scrolling while the Ctrl Key is pressed?

Thanks in advance for help.

Tomáš

GridView