C#

using System.Collections.Generic;

static class Program {
	static void Main() {
	}
}

public class ReportBandEntity { public int objcode, foo,bar; };

public class ReportBand {

	public List<ReportBandEntity> EntityList;

	// ... EntityList initialization code skipped

	public struct Group {
		public ReportBandEntity Header, Footer;
	}

	public List<Group> GroupList;

	public void GetGroupList() {

		GroupList = new List<Group>();

		foreach (ReportBandEntity e in EntityList)
			if (e.objcode == 1) {
				Group g = new Group();
				g.Header = e;
				GroupList.Add(g);
			}

		int i = 0;
		foreach (ReportBandEntity e in EntityList)
			if (e.objcode == 2) {
				//Error	2	Cannot modify the return value of 
				// 'System.Collections.Generic.List<mynsp.ReportBand.Group>.
				// this[int]' because it is not a variable	

				GroupList[i++].Footer = e;

				// this does not cause error but does not assign value to
				// GroupList[i++].Footer !
				//Group x = GroupList[i++];
				//x.Footer = e;
			}
	}
}

public partial class frmExpensesList : Form
 {
     // the sql connection
     SqlConnection sqlConn;
     // the sql adapter
     SqlDataAdapter sqlAdapter;
     // binding source
     BindingSource bind;
     // insert/update/delete command builder
     SqlCommandBuilder sqlCmd;
     // the actual table
     DataTable tbl;

     public frmExpensesList()
     {
         InitializeComponent();
     }

     private void frmExpensesList_Load(object sender, EventArgs e)
     {
         sqlConn = new SqlConnection();
         sqlConn.ConnectionString = "Integrated Security=true;" +
                                    "Initial Catalog=Expenses;" +
                                    "Data Source=(local);";

         string selCmd = "SELECT ID, Title FROM tblExpenseGroup";

         try
         {
             sqlConn.Open();
             // build sql adapter based on select command / connection string
             sqlAdapter = new SqlDataAdapter(selCmd, sqlConn);
             // generate update/insert/delete statements
             sqlCmd = new SqlCommandBuilder(sqlAdapter);
             // create table
             tbl = new DataTable();
             // localize table
             tbl.Locale = System.Globalization.CultureInfo.InvariantCulture;
             // fill table with data
             sqlAdapter.Fill(tbl);
             // create binding source
             bind = new BindingSource();
             // connect binding source with the table
             bind.DataSource = tbl;
             groupsGrid.AutoResizeColumns(DataGridViewAutoSizeColumnsMode.AllCellsExceptHeader);
             // connect grid with the binding source
             groupsGrid.DataSource = bind;
             // set ID to read only
             groupsGrid.Columns[0].ReadOnly = true;
         }
         catch (SqlException s)
         {
             MessageBox.Show(s.Message);
         }
         finally
         {
             sqlConn.Close();
         }
     }

     private void btnCancel_Click(object sender, EventArgs e)
     {
         Close();
     }
 }

private void Bar(SomeType myVariable)<br />
{<br />
     ...<br />
}