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toolbox shows items multiple times

Posted By:      Posted Date: September 14, 2010    Points: 0   Category :ASP.Net
My tool box shows the same tools about 12 times.  This is for all of them and for all categories.  I tried repairing it but it didn't work. 

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I am trying to add a list column to a document library. When I am running the application multiple times, the list column is also getting created multiple times. If the list column exist, i dont want to recreate the column, but only assign the value to that list column.

This is the code i have used:


SPView curview = list.DefaultView;
SPViewFieldCollection fieldCol = curview.ViewFields;
if (!fieldCol.Exists("Custom Column"))
AddField("FilesCount", SPFieldType.Text, list.Fields);
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int mouas =5;
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