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Assign Value to Control from Calculated Field in another Form

Assign Value to Control from Calculated Field in another Form
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The problem -All suppliers but one supply in Litres (the other Kg). Currently if the supplier is selected in ControlB a pop up form with unbound box for Kg and another with the conversion formula. So I close the form and type the calculated value to ControlC ( assuming I can remember the number and my yptos oops typos don't get in the way
how good would it be to update controlC with a Close Button on frmConvert
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I have this control, ctljoinEmployeeId, on my form and it is empty at the time that I want to assign a value to it.

In the add a record mode, I fill-in a combo box, cboEmployee, by choosing an employee name. In the After Update event for this combo box I assign the EmployeeName to a control, ctlEmployeeName, and all is well. Also at this point I want to assign the EmployeeId to a control, ctljoinEmployeeID. In the AfterUpdate for the for the Employee combo box the code to assign the EmployeeID is: Me.ctljoinEmployeeID = Me.cboEmployee.column(0). Both of the data types are text and the ctljoinEmployeeId is bound to a table field whilst the cboEmployee is bound to yet another table field, more correctly two fields, the name and id.

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I have a date field that caculates on click of a command button in a form. I like to use that calculated date in a message set in the body of an appointment reminder.

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I have a subform which refers values to controls on a form on which I have a calculated field -
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In a report I have a calculated control which is the difference between two numbers. Is there any way that I can sort using that control? When I refer to it in VBA in an orderby it asks for the parameter of that control since it is not an actual field. Neither can I sort by it in the sorting & grouping options again because it is not an actual field

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This question concerns a calculated field on frmNCC. they wanted this form as part in Access instead of in Excel where it belongs. So I slaved over the myriad calculations and came up with a beautiful, perfectly functioning form.

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