1:

dataGridView1.ClearSelection();					

1:
2:
3:
4:
5:
6:
7:

public class CustomDataGridView : DataGridView
{
  public void SetRowSelection(int rowIndex, bool selected)
  {
    base.SetSelectedRowCore(rowIndex, selected);
  }
}					

1:

CellBeginEdit					

1:

private volatile Boolean _noselection = true;					

1:
2:
3:
4:

if (_noselection)
            {
                dataGridView1.ClearSelection();
            }					

1:

_noselection = false;					

1:
2:
3:
4:
5:
6:
7:
8:
9:

public void BuildTable()
        {

            _table = new DataTable();

            _table.Columns.Add(new DataColumn("Kategorie", Type.GetType("System.String")));
            _table.Columns.Add(new DataColumn("Bewilligt", Type.GetType("System.Boolean")));
            dataGridView1.DataSource = _table;
        }					

1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:
21:

public void InitializeData()
        {
            var templiste = GetData();
            _table.Clear();

            foreach (string[] s in templiste)
            {
                if (CheckData(s))
                {
                    DataRow row = _table.NewRow();
                        row["Kategorie"] = s[0];
                        row["Bezeichnung"] = s[1] + " " + s[2];
                        row["Anzahl"] = s[3];
                        row["Beginn"] = s[4];
                        row["Ende"] = s[5];
                        row["Antragssteller"] = s[6];
                        row["Bewilligt"] = Convert.ToBoolean(s[7]);
                        _table.Rows.Add(row);
                }
            }
        }