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// List of selected columns
 private List<int> markedColumns;
// Counter for columns in the first row
 private int firstLineColumn;
 // Counter for columns in the following lines
 private int secondLineColumn;
 
 
// Matrix event handler
 private void Matrix2_BeforePrint(object sender, EventArgs e)
 {
// Create a new list for selected columns
 markedColumns = new List<int>();
// Reset the first row counter
 firstLineColumn = 0;
// Reset the next row count
 secondLineColumn = 0;
 }

 // Event handler for cells in the first row of the matrix
 private void Cell18_BeforePrint(object sender, EventArgs e)
 {
 // Use sender as TableCell
 TableCell cell = sender as TableCell;
 // Check the required value in the cell
 if (cell.Text == "2012" || cell.Text == "2014") 
 {
 // Sets the fill color for this cell.
 cell.FillColor = Color.Brown;
 // Save to selected list of columns
 markedColumns.Add(firstLineColumn);
 }
 // Increase column count for first row
 firstLineColumn++;
 }

// The event handler for the cells in the following rows of the matrix. You need to set it for the second row and the totals.
 private void Cell21_BeforePrint(object sender, EventArgs e)
 {
 // Use sender as TableCell
 TableCell cell = sender as TableCell;
 // Find the current index in the markedColumns list
 if (markedColumns.IndexOf(secondLineColumn) != -1)
 {
 // Sets the fill color for this cell.
 cell.FillColor = Color.Red;
 }
 // Increase counter
 secondLineColumn++;
 // Reset counter for next row
 if (secondLineColumn >= firstLineColumn)
 secondLineColumn = 0;