Export to excel just row colored ?

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C#

I have datagridview consisting the rows colored red which indicates an error and rows Not colored which indicates an correct I want export to excel just rows colored red help me please

What I have tried:

private void btnExporterError_Click(object sender, EventArgs e)
{
	Microsoft.Office.Interop.Excel._Application app
		= new Microsoft.Office.Interop.Excel.Application();

	Microsoft.Office.Interop.Excel._Workbook workbook
		= app.Workbooks.Add(Type.Missing);

	Microsoft.Office.Interop.Excel._Worksheet worksheet = null;

	app.Visible = true;
	
	// get the reference of first sheet. By default its name is Sheet1.  
	// store its reference to worksheet  
	worksheet = workbook.Sheets["Feuil1"];
	worksheet = workbook.ActiveSheet;

	// changing the name of active sheet  
	worksheet.Name = "Feuil1";

	// storing header part in Excel  
	for (int i = 1; i < dataGridView2.Columns.Count + 1; i++)
	{
		worksheet.Cells[1, i] = dataGridView2.Columns[i - 1].HeaderText;
	}

	DataTable src1 = GetDataTableFromDGV(dataGridView1);
	DataTable src2 = GetDataTableFromDGV(dataGridView2);
	ArrayList columnHeader = new ArrayList();
	ArrayList columnHeader2 = new ArrayList();

	foreach (DataGridViewColumn column in dataGridView1.Columns)
		columnHeader.Add(column.HeaderText);

	foreach (DataGridViewColumn column in dataGridView2.Columns)
		columnHeader2.Add(column.HeaderText);

	for (int i = 0; i < src1.Rows.Count; i++)
	{
		var row1 = src1.Rows[i].ItemArray;
		var row2 = src2.Rows[i].ItemArray;

		foreach (string colname in columnHeader)
		{
			var cell1 = dataGridView1.Rows[i].Cells[colname].Value;
			var cell2 = dataGridView2.Rows[i].Cells[colname].Value;
			var value = dataGridView2.Rows[i].Cells[colname].Value;
			worksheet
				.Rows[i + 2]
				.Cells[dataGridView2.Columns[colname].Index+1]
					= value;
			
			if ((cell1 + "").ToString() != (cell2 + "").ToString())
			{
				worksheet.Cells[i + 2, 
								dataGridView2.Columns[colname].Index + 1]
					.Interior.color = Color.Red;
			}
		}
	}

	app.Quit();
}