SearchResultCollection getting COMException Caught (A local error has occured)

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C#

C#4.0

Hi,

I have fetched the AD data. After fetching I am loop through each row and fetch the some property value. In between I am getting "COMException was caught", error message is "A local error has occured". Sometime I am getting this error after 1 lakh's record sometime i am getting with in 100 records.

foreach (SearchResult myresults in ResultCollection)
{
my code
}

What would be the problem? Please suggest me.