[v8i C#] Update informations about levels

Hi!

I learn programming for Microstation with use C#. And I have small problem with levels.

I have a 3 procedures:

1. Update DataGridView with level's informations.

2. Initialize Component.

3. Update Button Click.

But I have problem with this code. After rename level I press button Update (button2_Click), but in my LevelsGrid i see old name.

What am I doing wrong?

public void UpdateLevelsGrid()
        {
            LevelsGrid.RowCount = 1;
            MSApp.ActiveModelReference.Levels.Rewrite();
            BCOM.Levels myLevels = MSApp.ActiveModelReference.Levels;

            int UsedLevelsCount = 0;
            int LevelsWithPolygonsCount = 0;
            for (int i = 1; i <= myLevels.Count; i++)
            {
                int ElementsCount = 0;
                int PolygonsCount = 0;

                LevelsGrid.Rows.Add(myLevels[i].Number, myLevels[i].Name, ElementsCount, PolygonsCount);
            }
        }

public SamplePoints()
        {
            InitializeComponent();

            MSApp = BMI.Utilities.ComApp;

            UpdateLevelsGrid();
        }

private void button2_Click(object sender, EventArgs e)
        {
            UpdateLevelsGrid();
        }