How to solve TimeOut Expired Problem?

Using SQL Server 2005 and VB6

When I executing for yearly data or more than 3 months' data, it is showing "Timeout Expired" error. It is not executing completely.

My Connection String

ConnectionString = "Provider=SQLOLEDB.1;" & _
    "Persist Security Info=False; " & _
    "User ID=" & Settings.SQL_Username & _
    "; Password = " & Settings.SQL_Password & "; " & _
    "Initial Catalog=" & Settings.SQL_DatabaseName & ";" & _
    "Data Source=" & Settings.SQL_ServerAddress

How do I solve this problem?

Plz...