Server Error in '/' Application (university site)

today i try fill an form on --

http://ift.tt/1JZwo97

but following error occur (plz help its last date to fill addmission form)-

Server Error in '/' Application.

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: System.Data.SqlClient.SqlException: 

Source Error: 


Line 645:
Line 646:
Line 647:            studentCode = StudentReappearManager.SaveStudent(studentReappear, mode);
Line 648:
Line 649:            if (!string.IsNullOrEmpty(studentCode))

Source File: d:\www\reappear.mdurtk.in\OnlineReAppear\WebPart\OnlineReAppearSpecial\OnlineReappear.aspx.cs    Line: 647 

Stack Trace: 


[SqlException (0x80131904):  ]
   System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) +1960874
   System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +4890319
   System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +194
   System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) +2412
   System.Data.SqlClient.SqlDataReader.ConsumeMetaData() +59
   System.Data.SqlClient.SqlDataReader.get_MetaData() +83
   System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) +293
   System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async) +954
   System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result) +162
   System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) +32
   System.Data.SqlClient.SqlCommand.ExecuteScalar() +139
   DataObjects.DBAccess.SqlHelper.ExecuteScalar(SqlConnection connection, CommandType commandType, String commandText, SqlParameter[] commandParameters) in c:\Users\Administrator.MDUROHTAK\Downloads\Compressed\OnlineReAppear\OnlineReAppear\DataLayer\DBAccess.cs:761
   DataObjects.DBAccess.SqlHelper.ExecuteScalar(String connectionString, CommandType commandType, String commandText, SqlParameter[] commandParameters) in c:\Users\Administrator.MDUROHTAK\Downloads\Compressed\OnlineReAppear\OnlineReAppear\DataLayer\DBAccess.cs:712
   DataLayer.StudentReappearDB.SaveStudent(StudentReappear studentReappear, String mode) in c:\Users\Administrator.MDUROHTAK\Downloads\Compressed\OnlineReAppear\OnlineReAppear\DataLayer\StudentReappearDB.cs:151
   BusinessLayer.StudentReappearManager.SaveStudent(StudentReappear studentReappear, String mode) in c:\Users\Administrator.MDUROHTAK\Downloads\Compressed\OnlineReAppear\OnlineReAppear\BusinessLayer\StudentReappearManager.cs:30
   OnlineReAppearSpecial_OnlineReappear.SaveStudent(String mode) in d:\www\reappear.mdurtk.in\OnlineReAppear\WebPart\OnlineReAppearSpecial\OnlineReappear.aspx.cs:647
   OnlineReAppearSpecial_OnlineReappear.btnSave_Click(Object sender, EventArgs e) in d:\www\reappear.mdurtk.in\OnlineReAppear\WebPart\OnlineReAppearSpecial\OnlineReappear.aspx.cs:551
   System.Web.UI.WebControls.ImageButton.OnClick(ImageClickEventArgs e) +108
   System.Web.UI.WebControls.ImageButton.RaisePostBackEvent(String eventArgument) +118
   System.Web.UI.WebControls.ImageButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +36
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1565

Version Information: Microsoft .NET Framework Version:2.0.50727.6421; ASP.NET Version:2.0.50727.6427