XtraReport not responding when CreateDocument() in VB.NET Form

[Obuli]

In VB.NET i placed PrintControl in Form,then i am trying to show
report in this print control.

I am selecting nearly 30000 students,when executing
objRpt.CreateDocument()

line system is not responding and i am
getting "System.OutOfMemoryException"
But it works well when selecting 1000 records.

Private Sub ShowStudenReport()
Dim objRpt As New XtraRptStudent
Dim dsTest As DataSet

objRpt.DataSource = dsTest
objRpt.DataMember = dsTest.Tables(0).TableName
PrintControl1.PrintingSystem = objRpt.PrintingSystem
objRpt.CreateDocument()
End Sub

when executing line "objRpt.CreateDocument()" ,the system is not
responding...
please fix this bug.
Thankx.