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                string suche = textBox1.Text;

                OleDbConnection myConnection = new OleDbConnection(Settings.Default.Datenbank1ConnectionString);
                myConnection.Open();

                string mycommand = "SELECT * FROM Kontakte WHERE Firma ='" + textBox1.Text + "'";
                

                OleDbCommand cmd = new OleDbCommand(mycommand, myConnection);
                OleDbDataReader reader = cmd.ExecuteReader();

                while (reader.Read())
                {
                    string row = "";
                    for (int i = 0; i < reader.FieldCount; i++)
                    {
                        row += reader.GetValue(i).ToString() + ", ";
                        this.dataGridView1.Update();
                    }
                                     
                }
                reader.Close();

                myConnection.Close();