passing null values to parameters

... [ Team LiB ] Recipe 2.14 Passing Null Values to Parameters Problem You need to pass a null value to a parameter. Solution Use the System.DbNull.Value static value. The sample ... System.DBNull.Value using an equality operator. If the stored procedure accepts optional parameters parameters for which a default value is specified—you can set these parameters to null in C# or Nothing in ... set by passing System.DBNull.Value for the value argument when constructing the parameter or by setting the Value property of the Parameter object to System.DBNull.Value. To test for a null...

Ngày tải lên: 14/12/2013, 18:16

... default view to the grid. dataGrid.DataSource = dt.DefaultView; } private void filterButton_Click(object sender, System.EventArgs e) { String filter = SHIPREGION_FIELD + " IS NULL& quot;; ... filtered for rows containing a null ShipRegion field. The result of applying the filter is immediately reflected in any controls bound to the DataView object in addition to the any operations performed ... filterButton.Text = "Remove Filter"; } else { // Remove the filter. dv.RowFilter = ""; dataGrid.CaptionText = "Orders table: no filter."; filterButton.Text...

Ngày tải lên: 14/12/2013, 18:16

... Use annotations in the XML schema to control the handling of null values. The sample uses one XSD file: CategoriesDS_AnnotatedNull.xsd The schema used to generate the strongly typed DataSet. ... case, data is loaded into the DataSet. A row is added to the Categories table with a Description value of null. The data in the table is written to the text box on the form to demonstrate the effect ... ConfigurationSettings.AppSettings["Sql_ConnectString"]); if (annotatedRadioButton.Checked) { // Create the typed DataSet without null annotation. CategoriesDS_AnnotatedNull ds = new CategoriesDS_AnnotatedNull( ); // Fill the Categories...

Ngày tải lên: 14/12/2013, 18:16

... UnitPrice column contains a null value As mentioned, a Sql* type can store a null value. A null value is stored as Null. For example: SqlMoney unitPrice = productsSqlDataReader.GetSqlMoney(unitPriceColPos); ... unitPrice = Null Each of the Sql* types also has a Boolean property named IsNull that is true when the Sql* object contains a null value. For example: Console.WriteLine("unitPrice.IsNull = ... Console.WriteLine("unitPrice.IsNull = " + unitPrice.IsNull); This example displays: unitPrice.IsNull = True True is displayed because unitPrice contains Null. ...

Ngày tải lên: 21/01/2014, 07:20

... he would revert to his buffalo values and tactics and turn back into a buffalo and crash to the ground. I described this book to my staff and committed myself to continue to work on the transformation, ... interact with their families and to not get the rest that they needed. I found myself trying to get employees to leave. I would stop by on Saturday or Sunday to get something that I had left ... employ men and hire hands to work for you. But you must win their hearts to have them work with you.” Florio To love means to commit oneself without guarantee, to give oneself completely...

Ngày tải lên: 07/03/2014, 19:20

... Get* Methods to Read Column Values Before I show you the other Get* methods that read column values, you need to know the standard C# types and the values they support. You need to know these ... along with the underlying .NET type and the values that can be stored in the C# type. Table 9.3: STANDARD C# AND .NET TYPES C# TYPE .NET TYPE VALUES bool Boolean A Boolean true or false ... approximately +/-1.7 *10 308 with 15 to 16 significant figures of precision. float Single A 32-bit floating-point number between approximately +/-1.5 *10 - 45 to approximately +/-3.4 *10 38 with...

Ngày tải lên: 24/12/2013, 01:17

... used to allow channels to be changed only if tvPower is true. The function then sets a variable used to store the current channel of the television to the value of the parameter value sent to ... weightOnMoon variable's being set to a different value as well. Take a look at these function calls to the convertToMoonWeight() function: convertToMoonWeight(190); convertToMoonWeight(32); ... functionality to the numeric keypad on the remote control and to the TV channel Up and Down buttons, allowing them to change the channel displayed on the TV screen. The numeric buttons work by...

Ngày tải lên: 24/12/2013, 07:17

... FROM Customers WHERE CustomerID = @CustomerID UPDATE Customers SET CompanyName = @CompanyName WHERE CustomerID = @CustomerID DELETE FROM Customers WHERE CustomerID = @CustomerID Let's ... statement, you need to add the actual parameters to the SqlCommand object-and you'll do that in the next step. Step 2: Add Parameters to the Command Object To add parameters to your Command ... row to the Customers table was: INSERT INTO Customers CustomerID, CompanyName ) VALUES 'J3COM', 'Jason Price Corporation' ) As you can see, the values for the CustomerID...

Ngày tải lên: 21/01/2014, 07:20

... Columns to Display Aggregate Values Problem You want to add summary information such as averages, sums, and counts to a table based on related child rows. Solution Use expression columns to perform ... added to the Order Details table to calculate the extended price for each row. Aggregate values for the total extended price of the order and the number of Order Detail rows are added to the ... the line total. orderDetailTable.Columns.Add("OrderDetailTotal", typeof(Decimal), "(Quantity * UnitPrice) * (1-Discount)"); // Create the OrderDetails aggregate values in...

Ngày tải lên: 21/01/2014, 11:20

... sort. if(sortNoneRadioButton.Checked) dv.Sort = ""; else if(sortAscRadioButton.Checked) dv.Sort = "ExtendedPrice"; else if(sortDescRadioButton.Checked) dv.Sort = ... "DataColumn.Expression Property" topic in the MSDN Library. An expression column is added to a table either through one of the DataColumn constructors that take the expression for the ... object. dv = dt.DefaultView; // Bind the DataView to the DataGrid. resultDataGrid.DataSource = dv; } private void applyButton_Click(object sender, System.EventArgs e) { bool isLowerBound...

Ngày tải lên: 21/01/2014, 11:20

... according with sample pulses to fire thyristor valves. - Pulse Amplifier: to amplify both sample pusles and controlling pulses to fire desired thyristor valves. - Isolator: to isolate the power circuit ... time to issue controlling pulses in the positive half-cycles of applied voltage to thyritor valves. - Generate firing pulses to fire thyristor valves. The pulses have amplitudes from 2 V to 10 ... change in spite of using Automatic Reactive Power Regulator. To regulate voltage and cosφ in an expected range, it is necessary to change the parameters of regulators as the loads change. Determining...

Ngày tải lên: 05/03/2014, 14:20

... reduced QH 2 to cytochrome c. At the P-site, two electrons are transferred in a concerted manner from QH 2 to the iron–sulfur protein and to cytochrome b L . My- xothiazol (Myx) binds to the P-site ... Coq10p binding to Q 6 . To better understand the function of Coq10p, we tested the reducibility of Q 6 in a coq10 null mutant in the presence of inhibitors that block Q 6 binding to the P (o)-site ... of mitochondria at 400 lgÆmL protein )1 , or spheroplasts at 600 lgÆmL )1 total cell protein. All measurements were carried out in the pres- ence of 0.002% digitonin. In order to block cytochrome...

Ngày tải lên: 06/03/2014, 22:21

... SERPINE1 ⁄ PAI-1 (serpin peptidase inhibitor 1 ⁄ plasminogen activator inhibitor-1), TFDP1 (transcription factor Dp-1), TNFRSF10B (tumor necrosis factor receptor super- family, member 10b) and TYMS ... considered to be the best and easi- est approach to loss-of-function experiments. However, several recent stud- ies underscore the off-target and potential cytotoxic effects of siRNAs, which can lead to ... FEBS also able to trigger an ‘interferon (IFN) response’ through the activation of cytosolic proteins such as dsRNA-dependent protein kinase and ⁄ or membrane receptors such as Toll-like receptor 3 (TLR3),...

Ngày tải lên: 07/03/2014, 05:20

... to the age dependent changes in body composi- tion, it would be useful to obtain BIS reference values for the elderly. BIS-measured segmental total water volume has previously been reported to ... and -reactance values were calculated from the Cole–Cole model parameters obtained from BIS, using Matlab (Matlab Ò , R2006b, Mathworks). In order to compare body composition to a previous birth ... 52–5856 Original Article Body composition in the elderly: Reference values and bioelectrical impedance spectroscopy to predict total body skeletal muscle mass q Marja Tengvall a , Lars Ellegård a , * ,...

Ngày tải lên: 28/03/2014, 20:20

... regard these extreme values as noise, and ignore them. The problem is that one never knows if the extreme values are correct or not, and the challenge is how to handle “weird” values in the best ... Understandable Method to Treat Missing Values: Application to a Medical Data Set”, In ACM Comput. Surv. 1985. [11] Luai Al Shalabi, “A comparative study of techniques to deal with missing ... Accuracy Versus Tolerance 20 30 40 50 0% 5% 10% 15% 20% Tolerance Accuracy Average Class Probability Probability + Class Fig. 1 Accuracy versus Tolerance with 10% Missing values filled International...

Ngày tải lên: 28/03/2014, 23:20

Ngày tải lên: 28/03/2014, 23:20

Ngày tải lên: 18/06/2014, 22:20

Ngày tải lên: 19/06/2014, 10:20

Ngày tải lên: 19/06/2014, 10:20