Create Custom Control in C# from DataGridView

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C#2.0

C#

C#3.5

i have created a Custom Control in C# with following code

public bool _last;
        private void SupperDataGridView_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Enter)
            {
                e.SuppressKeyPress = true;
              
                int iColumn = this.CurrentCell.ColumnIndex;
                
                
                int iRow = this.CurrentCell.RowIndex;
                if (iColumn == this.Columns.Count - 1)
                {
                    if (iRow < this.Rows.Count - 1)
                    {
                        this.CurrentCell = this [0, iRow + 1];
                    }
                    else
                    {
                        _last = true;
                    }

                }
                else
                {
                    this.CurrentCell = this[iColumn +1,iRow];
                }
            }
        } 

This works fine in normal conditions, but, when i try to hide one or two columns, it gives me an error.

Can anyone help me with this code ? I want that when the user presses the enter-key the cursor should move to the right side rather than to the next row. If possible, if cell is blank, the cursor should jump to the next cell.