Question

I have two tables: A and B.

Table A:

Id | Number
1  | 2
2  | 5
3  | 1

Table B:

Id | Name
2  | X
5  | Y
1  | Z

When I get information from the database, I populate a DataSet. However, I use JOIN on A.Number = B.Name. So resulting in:

Result:

Id | Number | Name
1  | 2      | X
2  | 5      | Y
3  | 1      | Z

I have a DataGridView which displays the Result, but only Id and Name columns.

One thing bothers me. I would want to change Result.Name value in the DataGridView, but I want table A to be updated with respective A.Number value for the B.Name value. Table A doesn’t have Name column.

So I want to get things like this:

Table A before:

Id | Number
1  | 2

Number 2 accords to ‘X’ Name value.

Change Name in the DataGridView for ‘Y’ which accords to ‘5’ Number…

Table A after:

Id | Number
1  | 5

Answer 1

Don’t use a Join.

You want to show table A as the principal with a lookup column for Number.

You’ll need a Relation between A and B and an DataColumn with an Expression property on A