Vb net dataset updating
When the user selects checkbox, the selected rows should be seen in the datagridview of other form, Selected Bom..
There is datagridview in BOM which contains checkbox column..
It first performs UPDATE using INNER JOIN and then INSERTS all records that are not present in the table.
When the value is Nothing/null for the reference variable, that means it is not actually holding a reference to an instance of any object that exists on the heap. Net, you are trying to access a string that has not been initialized. You can’t even compile code like the following in C# Remember, a string is a reference type (a character array) that has to have a value.
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This is most common in classes where you are using class-wide instantiated objects.
If you create and drop your objects within each method, this isn’t going to be a problem, and you are actually following a better guideline by creating at the last necessary moment, and destroying at the first possible moment, not to mention avoiding possible exceptions like Invalid Reference Exception.
The first 4 records are already present in the Table, the only difference is that the countries of some records are modified for illustrating the bulk update operation.