Scenario :

I am using ultragrid with wincalcmanager in my application.

Ultragrid has two bounded columns : Roll (int),Name(string).

My applicaton lets the user build a formula for particular column by showing formula builder dialog at runtime.

User can also add some unbound columns to the grid.

Suppose, user adds one unbound column 'Marks'  of type int to the grid and try to set formula for that column by selecting 'Name' which of type string from operands pane of formula builder dialog.When user click OK button on formula builder dialog application throws system.format exception saying 'Input string is not in correct format' .The application shows unhandled exception dialog and then grid shows big RED cross.

If I perform the same case for bounded column 'Roll' which is also of type int ,  I doesn't get any type of exception and Roll column shows the same values which are in the Name Column.

I am not getting why this is happening.The exception which I get is Uncatchable.

I think this is serious problem with wincalcmanager.

If anybody came across this problem , please help me to resolve this problem.