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Help with changing DataBridView's cell colors for unmatching data

Hi,

I'm trying to use the code below to change the backcolor and textcolor of cell where the values are different when comparing rows as I loop through the Grid, but I receive the follow error:

Operator '=' is not defined for type 'DBNull' and type 'DBNull'.

For example (More columns in actual project) if my grid contains four rows the following columns:

CTRY Item
BEL BMW
BEL Toyota
USA Jeep
USA Jeep

I would like to change the color of the item column for the first two rows because the data in the Item column is not the same.

Code:

 Dim i, j As Integer
        For i = 1 To C1Screen2.Rows.Count - 1
            For j = 1 To C1Screen2.Columns.Count - 1
                If C1Screen2.Rows(i - 1).Cells("CTRY").Value = C1Screen2.Rows(i).Cells("CTRY").Value Then
                    If Not C1Screen2.Rows(i - 1).Cells(j).Value = C1Screen2.Rows(i).Cells(j).Value Then
                        C1Screen2.Rows(i - 1).Cells(j).Style.BackColor = Drawing.Color.Red
                        C1Screen2.Rows(i - 1).Cells(j).Style.ForeColor = Drawing.Color.White
                        C1Screen2.Rows(i).Cells(j).Style.BackColor = Drawing.Color.Red
                        C1Screen2.Rows(i).Cells(j).Style.ForeColor = Drawing.Color.White
                    Else
                        C1Screen2.Rows(i - 1).Cells(j).Style.BackColor = Drawing.Color.Blue
                        C1Screen2.Rows(i - 1).Cells(j).Style.ForeColor = Drawing.Color.White
                        C1Screen2.Rows(i).Cells(j).Style.BackColor = Drawing.Color.Blue
                        C1Screen2.Rows(i).Cells(j).Style.ForeColor = Drawing.Color.White
                    End If
                End If
            Next
        Next

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I used this code a while back in a different project not certain why it's not working now,

Thanks,

Victor

Nasir Razzaq

I would suggest you add another if statement before following

If C1Screen2.Rows(i - 1).Cells("CTRY").Value = C1Screen2.Rows(i).Cells("CTRY").Value

as below
If Not IsDBNull( C1Screen2.Rows(i - 1).Cells("CTRY").Value) AND Not IsDBNull(C1Screen2.Rows(i).Cells("CTRY").Value)

Victor Charles

ASKER

Hi,

I tried you approach but received error message:

Operator '=' is not defined for string " L534A1" and type default. (L534A1 is the value in first row of the third column)

On Line :

If Not C1Screen2.Rows(i - 1).Cells(j).Value = C1Screen2.Rows(i).Cells(j).Value Then

Thanks.

ASKER CERTIFIED SOLUTION

Ark

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Victor Charles

ASKER

Thanks, will try it and get back to you.

Victor Charles

ASKER

Hi,

When I add If C1Screen2.Rows(i).IsNewRow Then in my code thge error does not occur but

If Not C1Screen2.Rows(i - 1).Cells(j).Value = C1Screen2.Rows(i).Cells(j).Value Then

does not execute.

I tried you code but it does not consider that the SN values must be the same before comparing the rows, is there a way to modify it to work only for identical SN values?

For example If I have:

SN CTRY Item
10411 BEL BMW
10411 BEL Toyota
10421 USA Jeep
10451 USA Jeep

Only the first two rows should be compared because they both have SN = 10411. Also Is it possible to only change the color of the cells that do not match instead of the entire row.

Thanks,

Victor

Thanks,

Victor

Victor Charles

ASKER

Thank You.