Question

I have defined the following variable

var result = from report in firoozehDataContext.Reports select report;

now if i want delete One of the columns in the variable, how do i it?

Answer 1

Unless you have grave concerns about performance, this seems like the kind of thing that should be handled at the UI level and not in your data access code.

I get the impression that you are taking the results of this query and binding to a grid or list with auto-generated columns. However, it is much easier (and safer) to control which columns are visible in a grid than it is to dynamically build a SQL SELECT query. Auto-generated columns are really only appropriate for scaffolding scenarios.

Another good reason why I would recommend against doing what you’re doing is that every time your end user decides to hide (or re-show) another column, you’re forced to re-run your entire query. This is almost certainly not what you really want.

I would simply select all the columns that could be available and hide the ones that shouldn’t be available as part of the UI code.