SqlDataReader dr = cmd.ExecuteReader();

				do
				{
					while(dr.Read())
				{
					for(int i =  0 ; i < dr.FieldCount; i++)
						sb.Append(dr[i].ToString() + "; ");

					sb.Append(Environment.NewLine);
				}

					sb.Append(Environment.NewLine);
				} while(dr.NextResult());

				dr.Close();
				conn.Close();

				resultTextBox.Text = sb.ToString();

.
.
String sqlText = @"select count(OrderID) From Orders where OrderDate Between @Nachalo And @Konec";
.
.
				SqlCommand cmd = new SqlCommand(sqlText, conn);
				conn.Open();
				cmd.Parameters.Add ("@Nachalo", SqlDbType.DateTime.ToString());
				cmd.Parameters.Add ("@Konec", SqlDbType.DateTime.ToString());
				cmd.Parameters[ 0 ].Value = "01.07.1996";
				cmd.Parameters[ 1 ].Value = "31.07.1996";
				SqlDataReader dr = cmd.ExecuteReader();

String sqlText = @"select count(OrderID) From Orders where OrderDate Between ? And ?";

cmd.Parameters.Add (?, SqlDbType.DateTime);
cmd.Parameters.Add (?, SqlDbType.DateTime);
cmd.Parameters[ 0 ].Value = "01.07.1996";
cmd.Parameters[ 1 ].Value = "31.07.1996";