Issue adding sharepoint listitems after upload process is done

the screen shows the error comes when doing any kind of operations on sharepoint site like adding listitem,permission or even deleting any listitem.

this occurs when i run my custom upload process which includes uploading metadata from excel and saving it in custom lists.

when i go beyond 1500 listitems i get this issue..

please help me on this...

0x80070057

Here i write a Two conditions like as below

SPWeb web = SPContext.Current.Web;
SPList list = web.Lists["Student Profile"];
string caml = string.Format(@"{0}{1}", DropDownList2.Text,DropDownList3.Text);
SPQuery query = new SPQuery(list.DefaultView);
query.Query = caml;
SPListItemCollection items = list.GetItems(query);
st_attendence.DataSource = items.GetDataTable();
st_attendence.DataBind();
Controls.Add(st_attendence);

In above code i used two condions (Academic Year and Class). At this time getting this Error

0x80070057

If i write one condition it works fine. But it does't work for 2 or 3 conditions



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ans :


I have also spent lot time in this found that the spquery tag are case sensitive and i was using instead of



Just make sure you are writing the exact query syntax..