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Observe the Allow Nulls column in the design window of the Department table some fields have this check box checked, but others don t. If the check box is checked, the column is allowed to store the NULL value. The best and shortest definition for NULL is undefined. In your Department table, only DepartmentID and Name are required, so Description is optional meaning that you are allowed to add a new department without supplying a description for it. If you add a new row of data without supplying a value for columns that allow nulls, NULL is automatically supplied for them. Especially for character data, a subtle difference exists between the NULL value and an empty value. If you add a product with an empty string for its description, this means that you actually set a value for its description; it s an empty string, not an undefined (NULL) value. The primary key field never allows NULL values. For the other columns, it s up to you to decide which fields are required and which are not. In some cases, instead of allowing NULLs, you ll prefer to specify default values. This way, if the value is unspecified when creating a new row, it will be supplied with the default value. The default value can be a literal value (such as 0 for a Salary column or "Unknown" for a Description column), or it can be a system value (such as the GETDATE function, which returns the current date). In 10, you ll have a column named DateCreated, which can be set to have the default value supplied by the GETDATE function. asp.net qr code generator open source Generate QR Code and display image dynamically in asp . net using c 29 Dec 2018 ... This tutorial shows How to generate QR Code and display and save QR Codeimage to folder in asp . net using c# using Google chart API and ... asp.net qr code generator ASP . Net MVC: Dynamically generate and display QR Code Image 4 Dec 2017 ... Here Mudassar Ahmed Khan has explained with an example, how to dynamically generate and display QR Code Image in ASP . Net MVC Razor.The QR Code Image will be dynamically generated in ASP . 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SQL Server guarantees that the generated values are always unique, which makes them especially useful when used in conjunction with the PRIMARY KEY constraint. You already know that primary keys are used on columns that uniquely identify each row of a table. If you set a primary key column to also be an identity column, SQL Server automatically fills that column with values when adding new rows (in other words, it generates new IDs), ensuring that the values are unique. When setting an identity column, you must specify an identity seed, which is the first value that SQL Server provides for that column, and an identity increment value, which specifies the number of units to increase between two consecutive records. By default, identity seed and identity increment values are both set to 1, meaning that the first value will be 1 and the following ones will be generated by adding 1 to the last created value. You don t need to specify other values because you don t care what values are generated anyway. Although it wasn t shown in the earlier Figure 3-9, DepartmentID in your Department table is an identity column. You ll learn how to set identity columns a bit later, when creating the Department table. asp.net mvc qr code How to generate QR codes with ASP . NET MVC ? - Estrada Web Group 6 Jun 2018 ... In this post we will see how to generate QR codes with ASP . NET MVC . Step 1.First create a new MVC project as shown in the following images ... asp.net mvc generate qr code QR Code generation in ASP . NET MVC - Stack Overflow So, on your page (assuming ASPX view engine) use something like this: ... publicstatic MvcHtmlString QRCode (this HtmlHelper htmlHelper, string .... http://www.esponce.com/api/v3/ generate ?content=Meagre+human+needs ... Note The generated values for identity columns are unique over the life of your table. A value that was generated once will never be generated again, even if you delete all the rows from the table. If you want SQL Server to restart numbering from the initial value, you need to either delete and re-create the table or truncate the table using the TRUNCATE SQL command. Truncating a table has the same effect as deleting and creating it again. The first thing you need to do is assign which pins control the speed and direction. On the Ardumoto shield these are fixed at Pins 3, 11, 12, and 13: int int int int speed1 = 3; speed2 = 11; direction1 = 12; direction2 = 13; This is the same view as shown in the previous section, but with a Spinner instead of a ListView. The Spinner property android:drawSelectorOnTop controls whether the arrow is drawn on the selector button on the right side of the Spinner UI. To populate and use the Spinner, we need some Java code: asp.net vb qr code QR Code ASP . NET Control - QR Code barcode image generator ... 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