.net c# SQL timeout issue

Server Error in '/' Application. Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: [login to view URL]: Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding. Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. Stack Trace: [SqlException (0x80131904): Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.] [login to view URL](SqlException exception, Boolean breakConnection) +1950890 [login to view URL](SqlException exception, Boolean breakConnection) +4846875 [login to view URL](TdsParserStateObject stateObj) +194 [login to view URL](RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) +2392 [login to view URL]() +33 System.Data.SqlClient.SqlDataReader.get_MetaData() +83 [login to view URL](SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) +297 [login to view URL](CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async) +954 [login to view URL](CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result) +162 [login to view URL](CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) +32 [login to view URL](CommandBehavior behavior, String method) +141 [login to view URL](CommandBehavior behavior) +12 [login to view URL](CommandBehavior behavior) +10 [login to view URL](DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +130 [login to view URL](DataTable[] dataTables, Int32 startRecord, Int32 maxRecords, IDbCommand command, CommandBehavior behavior) +162 [login to view URL](DataTable dataTable) +115 [login to view URL](Decimal Year, Nullable`1 AffiliateID) +490 [login to view URL](Int32 Year, Int32 AffiliateID) +152 Admin_Admin_Invoice.Page_Load(Object sender, EventArgs e) +524 [login to view URL](IntPtr fp, Object o, Object t, EventArgs e) +14 [login to view URL](Object sender, EventArgs e) +35 [login to view URL](EventArgs e) +99 [login to view URL]() +50 [login to view URL](Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627