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26 Sep

if u have to use the view and update ur orginal table i dont think there is another way other than building the commands as i showed earlier..

Gautham Please explain what you mean by: if u were using the table intead and only specifying (selecting in the designer) the fields u want then the command would be built correctly by the designer and would work..

You either never assigned something to the variable, never created an instance of the value assigned to the variable, or you set the variable equal to Nothing/null manually, or you called a function that set the variable to Nothing/null for you. You don’t have to use the “new” keyword, but by default the value is Nothing/null.

You would have to at least initialize to a = String. Again, this is code that C# will not compile, but VB. Same as a string, any reference type must be initialized.

Empty, or to some other actual value, before it will compile in C#, or run without exception in VB. Net, set [a = “something”] before you attempt to do anything with it. Strings and some other CTS types have a misconception of being value types, like Integers, and they are not.

If you also check the "Create methods to send updates directly to the database", then you get an update method with a parameter for each column. David if the dataset was auto generated by the studio it will automatically bind those parameters to the columns in a datatable contained in ur dataset like take an example u have a table in ur dataset called "Employee" and it has three fields empid,name,age then if empid is ur promary key the designer generated update command would be like would be like "update employee set empname = @empname , empage = @empage where emid = @empid" u neednt provide these parametrs the designer would have binded these parameters to ur coreesponding columns in the employee table if ur interested this is how its done first we set the adapter.update command to the above said query the we add sql parameters to the update command like Adapter. If I try to add one now, the wizard presents me with a dialog box with UPDATE and expects me to type the entire query. (2) If I start from scratch with a new Data Set/Table Adapter over my database view, the same happens.

In order to reduce the possibility of invalid data, you can use properties of the values: // Create the Unique Constraint object. Sql Client; public class Fill With Constraints If you omit the that relates product records to a specific category: Foreign Key Constraint fc = new Foreign Key Constraint(“Category ID”, ds.

Unique Constraint uc = new Unique Constraint(“ID”, dt. Add(uc); You can also define a that encompasses several columns, such as this first and last name combination: // Create an array with the two columns. // Create a Unique Constraint object that represents the primary key. Columns[“Customer ID”], false); However, it’s quite possible that you won’t use any of these approaches to generate uses any non-nullable unique column returned by the query. Add unique constraints to a data source // Fill With – Create Unique Constraints defined in data source using System; using System.

Again, same exception gets thrown, but coming from withing the instantiated class itself.

The Get Orders function inside of Customers requires an instance of a connection, but you disposed of the required objects required to access the database back up in Load Data() when you called a. Be careful when you clean up your instances, that you are not using them again somewhere.