Forms Data Controls :: DropDownLists With ControlParameters That Reference Each Other?

Feb 15, 2010

I have two DropDownLists, and each one has a Control Parameter that references the other.

The idea is that if you select a value in either one of them, it restricts the possible values you can select in the other. And the user may select either one of them first.

Each one has an "All" option for selecting all values. (They are both used to restrict rows that populate a GridView).

This is all done using SQLDataSources.

The problem is that it doesn't seem to work at all. Both DropDownLists are empty, and the SQL that populates them never hits the SQL Server. But there is no error displayed.

If I have it going only one way, it does work, so I think the problem is the recursive nature of having them reference each other.

It would seem to be quite a common requirement, so its there any way of getting this to work?

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[Code]....

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[CODE]..

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[Code] ....

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Line 312:
Line 313:
Line 314: int result = Convert.ToInt32(_cmd.ExecuteScalar()); Line 315: _cn.Close();
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Line 312:
Line 313:
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