System.runtime.interopservices.comexception: 'the RPC server is unavailable.

See more:

C#

In my project, I have a subprocess with a function for searching for a user name in all the sheets and displaying them in a listbox. When an item in the list is selected, it displays that month. This works good, but if the user closes the workbook and selects another entry, I check for the file to be opened and if not I reopen it that is when I get the error.

"System.Runtime.InteropServices.COMException: 'The RPC server is unavailable."

try
            {
                //Check and see if the user closed the workbook
                frmFoodPantry.objApp.Workbooks.get_Item(RegGlobals.excelFileName);
            }
            // If the work book was not open then open the workbook, then open the requeste form.
            catch
            {
                // The user did close the workbook so reopen it
                frmFoodPantry.theWorkbook = frmFoodPantry.objApp.Workbooks.Open(RegGlobals.StrPath);

            }

The line that errors is in the catch pharse.

What I have tried:

try
            {
                //Check and see if the user closed the workbook
                frmFoodPantry.objApp.Workbooks.get_Item(RegGlobals.excelFileName);
            }
            // If the work book was not open then open the workbook, then open the requeste form.
            catch
            {
                // The user did close the workbook so reopen it
                frmFoodPantry.theWorkbook = frmFoodPantry.objApp.Workbooks.Open(RegGlobals.StrPath);
            }