Problem setting background color of a row

[Hilda Kenny]

hi,
I recently upgraded to 2010 Q2 and since then I get an error: 'Object Reference not set to an instance of an object' on this line:

e.RowElement.BackColor =

CType(_colourConvert.ConvertFromString(e.RowElement.RowInfo.Cells(_StatusColour).Value().ToString), System.Drawing.Color)

 

Any help would b appreciated.

[Eric]

You are obviously in a grid event since you are referencing e as an event args. I'm assuming the RowFormatting event?? Anyway, what object is nothing? If you put a breakpoint in the event and start dragging the objects into the watch window you should see which object is nothing. You can also add code above the line like

if(Not(e is nothing)) then
   If(Not(e.RowElement is Nothing)) Then
       If(Not(e.RowElement.RowInfo is Nothing)) Then
          If(Not(e.RowElement.RowInfo.Cells(_StatusColour) is Nothing)) Then
              If(Not(.RowElement.RowInfo.Cells(_StatusColour).Value is Nothing)) Then
                     e.RowElement.BackColor =

                           CType(_colourConvert.ConvertFromString(e.RowElement.RowInfo.Cells(_StatusColour).Value().ToString), System.Drawing.Color)

             End if
        End if
       End if
     End if
End if

That should stop the error but you still might be missing the functionality do to your BackColor will not be set when one of those objects is null. If you find the object that is nothing by checking it in the watch you can just add that corresponding above if statement

Eric

[Stefan]

Hello everyone,

Thank you for writing.

@Hilda
I would suggest you to take a look at this blog post which you might find helpful when working with RowElement and CellElement.

As to your question regarding changing the backcolor, please subscribe for the RowFormatting event and add the following code snippet:

void radGridView1_RowFormatting(object sender, Telerik.WinControls.UI.RowFormattingEventArgs e)
        {
            int indexOfMyFavoriteRow = 2;
            if (e.RowElement.RowInfo.Index == indexOfMyFavoriteRow)
            {
                e.RowElement.DrawFill = true;
                e.RowElement.BackColor = Color.Red;
                e.RowElement.BackColor2 = Color.Red;
                e.RowElement.BackColor3 = Color.Red;
                e.RowElement.BackColor4 = Color.Red;
            }

        }

I hope you find this information helpful. If there is anything else we can help you with, do not hesitate to contact us.

All the best,
Stefan
the Telerik team

[Hilda Kenny]

I'll have a look, thanks.