set background and foreground color on specified cell

Hello Pierre-Jean,

The appropriate place where you can introduce visual customizations of the cells in RadGridView is the CellFormatting event. When using the CellFormatting event, you have access to the Row, RowIndex as well as Column, and ColumnName properties. Please refer to the following example:

private void RadGridView1_CellFormatting(object sender, Telerik.WinControls.UI.CellFormattingEventArgs e)
        {
            if (e.Row.IsCurrent && e.ColumnIndex == 1 && e.RowIndex ==2)
            {
                e.CellElement.BackColor = Color.Yellow;
                e.CellElement.DrawFill = true;
                e.CellElement.GradientStyle = GradientStyles.Solid;
                e.CellElement.ForeColor = Color.Red;
            }
            else
            {
                e.CellElement.ResetValue(LightVisualElement.BackColorProperty, Telerik.WinControls.ValueResetFlags.Local);
                e.CellElement.ResetValue(LightVisualElement.DrawFillProperty, Telerik.WinControls.ValueResetFlags.Local);
                e.CellElement.ResetValue(LightVisualElement.GradientStyleProperty, Telerik.WinControls.ValueResetFlags.Local);
                e.CellElement.ResetValue(VisualElement.ForeColorProperty, ValueResetFlags.Local);
            }
        }

More information about formatting cells is available here. 

I hope this helps. Should you have further questions I will be glad to help.

Regards,
Nadya
Progress Telerik

Hello Nadya

Thanks for your prompt response however I think that it is not the solution I am seeking
Your solution permits to change the cell fore and back color of the current cell (nad I already do this i another context)
While what  I am looking for is a way to change the color of a cell outside of the gridview event, just by knowing the cell location (row and cell in the row) or changing a cell in the currently selected row but not the selected cell
… but this may not be possible ...
Thanks

Hello Piere-Jean,

I am sorry to hear that this solution is not appropriate for you.

Actually it is possible to set styles to cells in runtime without using events like CellFormatting or RowFormatting. The GridViewCellInfo.Style property gives direct access to the cell’s visual properties. You can define first what visual setting should the cell use by setting CustomizeFill or CustomizeBorder properties and then apply the customizations to a specified cell by using the Rows and Cells collections.

You can find more information about using the Style property here. Could you please refer to it and see if this is suitable for your scenario.

I hope this helps. Do not hesitate to contact me in case of any difficulties.

Regards,
Nadya
Progress Telerik

Hello Pierre-Jean,

Following the provided information I was not able to reproduce the issues that you described. The text color on my side is colored correctly and the back color is applied immediately when the grid is shown. I attached my sample project for your reference. Could you please refer to it and let me know how it differs from your real set up. 

I am looking forward to your reply.

Regards,
Nadya
Progress Telerik

Hello Nadya

Thanks for your reply,

Indeed your test program does the expected job, with one unexpected behavior, if I remove the "setbackcolor", the cell background of the cell becomes darkgrey 

However I still have the problem in my Program ...

Here is the code I am using

        Dim HorseCell As GridViewCellInfo = gvEntry.CurrentRow.Cells("CurrentName")

        HorseCell.Style.CustomizeFill = True
        HorseCell.Style.BackColor = Color.Yellow
        HorseCell.Style.ForeColor = Color.Red

This code is invoked on the Click event of a popup menu:
1. I need to click on another cell or row of the grid to see the change
2. The BackColor does change to Yellow
3. The forecolor does not change and remains black

If I remove the Backcolor= Color.Yellow line the cell backcolor will be drak grey as in your test program

I don't know if it is relevant but my grid is databound to a database datasource.

If you have no other suggestion I'll create a standalone project to demonstrate the problem

Best Regards

Pierre-Jean 

Hello Perre-Jean,

Note, if you want to customize the BackColor of the cell via the Style property it is necessary to set CustomizeFill to true. Thus, the specified color will be set. If you set just CustomizeFill to true without setting the BackColor of the style object, the default dark gray color will be set which is the one that you see. If you do not want to set any color to the BackColor just set the CustomizeFill to false.

According to the problem that you have when applying ForeColor/BackColor I was not able to reproduce it on my end. As you can see from the attached project everything works fine on my end. This is why I would kindly ask you to modify the project in order to reproduce the problem that you are facing. Thus, we will be able to investigate the precise case and assist you further.

I am looking forward to your reply.

Regards,
Nadya
Progress Telerik