DataGridView.DrawingRowNumbers

CutList/CutList.csproj

@@ -86,6 +86,7 @@
     <Compile Include="Controls\BinLayoutView.cs">
       <SubType>Component</SubType>
     </Compile>
+    <Compile Include="Forms\DataGridViewExtensions.cs" />
     <Compile Include="Forms\MainForm.cs">
       <SubType>Form</SubType>
     </Compile>

CutList/Forms/DataGridViewExtensions.cs

@@ -0,0 +1,31 @@
+using System.Drawing;
+using System.Windows.Forms;
+
+namespace CutList.Forms
+{
+    public static class DataGridViewExtensions
+    {
+        static readonly StringFormat CenterVerticallyFormat = new StringFormat
+        {
+            Alignment = StringAlignment.Far,
+            LineAlignment = StringAlignment.Center
+        };
+
+        public static void DrawingRowNumbers(this DataGridView dataGridView)
+        {
+            dataGridView.RowPostPaint += (sender, e) =>
+            {
+                var rowNumber = (e.RowIndex + 1).ToString();
+                var headerBounds = new Rectangle(e.RowBounds.Left, e.RowBounds.Top, dataGridView.RowHeadersWidth - 4, e.RowBounds.Height);
+
+                e.Graphics.DrawString(
+                    rowNumber,
+                    dataGridView.Font,
+                    Brushes.Blue,
+                    headerBounds,
+                    CenterVerticallyFormat);
+            };
+
+        }
+    }
+}

CutList/Forms/MainForm.cs

@@ -26,6 +26,9 @@ namespace CutList.Forms
             items = new BindingList<Item>();
             bins = new BindingList<BinInputItem>();
 
+            dataGridView1.DrawingRowNumbers();
+            dataGridView2.DrawingRowNumbers();
+
             itemBindingSource.DataSource = items;
             itemBindingSource.ListChanged += ItemBindingSource_ListChanged;
 

CutList/Forms/ResultsForm.cs

@@ -18,23 +18,7 @@ namespace CutList.Forms
         public ResultsForm()
         {
             InitializeComponent();
-
-			dataGridView1.RowPostPaint += DataGridView1_RowPostPaint;
-		}
-
-		private void DataGridView1_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
-		{
-			var grid = sender as DataGridView;
-			var rowIdx = (e.RowIndex + 1).ToString();
-
-			var centerFormat = new StringFormat()
-			{
-				Alignment = StringAlignment.Far,
-				LineAlignment = StringAlignment.Center
-			};
-
-			var headerBounds = new Rectangle(e.RowBounds.Left, e.RowBounds.Top, grid.RowHeadersWidth - 4, e.RowBounds.Height);
-			e.Graphics.DrawString(rowIdx, this.Font, Brushes.Blue, headerBounds, centerFormat);
+            dataGridView1.DrawingRowNumbers();
         }
 
         private void dataGridView1_RowEnter(object sender, DataGridViewCellEventArgs e)