Changing datagridview cell color based on condition

Question

I have loaded the data from database to datagridview and have two columns target value and volume where volume >target value that volume cell should be in green color and

Answer 1

You need to do this

private void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
    foreach (DataGridViewRow Myrow in dataGridView1.Rows) 
    {            //Here 2 cell is target value and 1 cell is Volume
        if (Convert.ToInt32(Myrow .Cells[2].Value)<Convert.ToInt32(Myrow .Cells[1].Value))// Or your condition 
        {
            Myrow .DefaultCellStyle.BackColor = Color.Red; 
        }
        else
        {
            Myrow .DefaultCellStyle.BackColor = Color.Green; 
        }
    }
}

Meanwhile also take a look at Cell Formatting

Answer 2

Without looping it can be achived like below.

private void dgEvents_RowPrePaint(object sender, DataGridViewRowPrePaintEventArgs e)
    {

        FormatRow(dgEvents.Rows[e.RowIndex]);

    }

private void FormatRow(DataGridViewRow myrow)
    {
        try
        {
            if (Convert.ToString(myrow.Cells["LevelDisplayName"].Value) == "Error")
            {
                myrow.DefaultCellStyle.BackColor = Color.Red;
            }
            else if (Convert.ToString(myrow.Cells["LevelDisplayName"].Value) == "Warning")
            {
                myrow.DefaultCellStyle.BackColor = Color.Yellow;
            }
            else if (Convert.ToString(myrow.Cells["LevelDisplayName"].Value) == "Information")
            {
                myrow.DefaultCellStyle.BackColor = Color.LightGreen;
            }
        }
        catch (Exception exception)
        {
            onLogs?.Invoke(exception.Message, EventArgs.Empty);
        }
    }

Answer 3

I know this is an old post, but I found my way here in 2018, so maybe someone else will too. In my opinion, the OP had a better approach (using dgv_DataBindingComplete event) than any of the answers provided. At the time of writing, all of the answers are written using paint events or cellformatting events which seems inefficient.

The OP was 99% of the way there, all they had to do was loop through their rows, test the cell value of each row, and set the BackColor, ForeColor, or whatever other property you want to set.

Please excuse the vb.NET syntax, but I think its close enough to C# that it should be clear.

Private Sub dgvFinancialResults_DataBindingComplete Handles dgvFinancialResults.DataBindingComplete
            Try
                Logging.TraceIt()
                For Each row As DataGridViewRow in dgvFinancialResults.Rows
                    Dim invoicePricePercentChange = CSng(row.Cells("Invoice Price % Change").Value)
                    Dim netPricePercentChange = CSng(row.Cells("Net Price % Change").Value)
                    Dim tradespendPricePercentChange = CSng(row.Cells("Trade Spend % Change").Value)
                    Dim dnnsiPercentChange = CSng(row.Cells("DNNSI % Change").Value)
                    Dim cogsPercentChange = CSng(row.Cells("COGS % Change").Value)
                    Dim grossProfitPercentChange = CSng(row.Cells("Gross Profit % Change").Value)


                    If invoicePricePercentChange > Single.Epsilon Then
                        row.Cells("Invoice Price % Change").Style.ForeColor = Color.Green
                    Else
                        row.Cells("Invoice Price % Change").Style.ForeColor = Color.Red
                    End If

                    If netPricePercentChange > Single.Epsilon Then
                        row.Cells("Net Price % Change").Style.ForeColor = Color.Green
                    Else
                        row.Cells("Net Price % Change").Style.ForeColor = Color.Red
                    End If

                    If tradespendPricePercentChange > Single.Epsilon Then
                        row.Cells("Trade Spend % Change").Style.ForeColor = Color.Green
                    Else
                        row.Cells("Trade Spend % Change").Style.ForeColor = Color.Red
                    End If

                    If dnnsiPercentChange > Single.Epsilon Then
                        row.Cells("DNNSI % Change").Style.ForeColor = Color.Green
                    Else
                        row.Cells("DNNSI % Change").Style.ForeColor = Color.Red
                    End If

                    If cogsPercentChange > Single.Epsilon Then
                        row.Cells("COGS % Change").Style.ForeColor = Color.Green
                    Else
                        row.Cells("COGS % Change").Style.ForeColor = Color.Red
                    End If

                    If grossProfitPercentChange > Single.Epsilon Then
                        row.Cells("Gross Profit % Change").Style.ForeColor = Color.Green
                    Else
                        row.Cells("Gross Profit % Change").Style.ForeColor = Color.Red
                    End If
                Next
            Catch ex As Exception
                Logging.ErrorHandler(ex)
            End Try
        End Sub

Answer 4

I may suggest NOT looping over each rows EACH time CellFormating is called, because it is called everytime A SINGLE ROW need to be refreshed.

Private Sub dgv_DisplayData_Vertical_CellFormatting(sender As Object, e As DataGridViewCellFormattingEventArgs) Handles dgv_DisplayData_Vertical.CellFormatting
        Try

            If dgv_DisplayData_Vertical.Rows(e.RowIndex).Cells("LevelID").Value.ToString() = "6" Then

                e.CellStyle.BackColor = Color.DimGray
            End If
            If dgv_DisplayData_Vertical.Rows(e.RowIndex).Cells("LevelID").Value.ToString() = "5" Then
                e.CellStyle.BackColor = Color.DarkSlateGray
            End If
            If dgv_DisplayData_Vertical.Rows(e.RowIndex).Cells("LevelID").Value.ToString() = "4" Then
                e.CellStyle.BackColor = Color.SlateGray
            End If
            If dgv_DisplayData_Vertical.Rows(e.RowIndex).Cells("LevelID").Value.ToString() = "3" Then
                e.CellStyle.BackColor = Color.LightGray
            End If
            If dgv_DisplayData_Vertical.Rows(e.RowIndex).Cells("LevelID").Value.ToString() = "0" Then
                e.CellStyle.BackColor = Color.White
            End If

        Catch ex As Exception

        End Try

    End Sub

Answer 5

make it simple

private void dataGridView1_cellformatting(object sender,DataGridViewCellFormattingEventArgs e)
{
     var amount = (int)e.Value;

     // return if rowCount = 0
     if (this.dataGridView1.Rows.Count == 0)
         return;

     if (amount > 0)
         e.CellStyle.BackColor = Color.Green; 
     else
         e.CellStyle.BackColor = Color.Red;

}

take a look cell formatting

Answer 6

foreach (DataGridViewRow row in dgvWebData.Rows)
{
    if (Convert.ToString(row.Cells["IssuerName"].Value) != Convert.ToString(row.Cells["SearchTermUsed"].Value))
    {
        row.DefaultCellStyle.BackColor = Color.Yellow;
    }
    else
    {
        row.DefaultCellStyle.BackColor = Color.White;
    }
}

This Perfectly worked for me . even if a row is changed, same event takes care.