Getting error in script component

Hi All,

I am getting the below error when i'm trying to edit the script component. can anyone please let me know how to resolve this error:-

Error at Data Flow Task  contains script component [Script Component [566]]: System.NullReferenceException: Object reference not set to an instance of an object.

   at Microsoft.SqlServer.Dts.Pipeline.ScriptComponentHost.HandleUserException(Exception e)

   at Microsoft.SqlServer.Dts.Pipeline.ScriptComponentHost.ReleaseConnections()

   at Microsoft.SqlServer.Dts.Pipeline.ManagedComponentHost.HostReleaseConnections(IDTSManagedComponentWrapper100 wrapper)Object reference not set to an instance of an object. (Microsoft.SqlServer.DTSPipelineWrap)

The code in script component is as below:-

publicclassScriptMain :UserComponent

{

   SqlConnectionsqlConn = newSqlConnection();

   SqlCommandsqlCmd = newSqlCommand();

   SqlParametersqlParam = newSqlParameter();

   SqlDataReadersqlreader;

    IDTSConnectionManager100connMgr;

   ///<summary>

   /// Override the PreExecute method to prepare to save the data

   ///

   ///</summary>

   publicoverridevoidPreExecute()

   {

       stringsqlCmdQuery = "Select * from Table1 where [Cust_Num] = @CustNum and [Contract_Id]= @ContractID";

       sqlCmd = newSqlCommand(sqlCmdQuery, sqlConn);

       sqlParam = newSqlParameter("@CustNum",SqlDbType.VarChar,20);

       sqlCmd.Parameters.Add(sqlParam);

       sqlParam = newSqlParameter("@ContractID",SqlDbType.VarChar, 40);

       sqlCmd.Parameters.Add(sqlParam);

   }

   ///<summary>

   /// Override the AcquireConnections method to connect to the external data source. Extract the connection object,

   /// or the required connection information, from the connection manager.

   ///</summary>

   ///<param name="Transaction"></param>

   publicoverridevoidAcquireConnections(objectTransaction)

   {

       try

       {

           connMgr = this.Connections.OleDBConnMgr;;

           sqlConn = (SqlConnection)connMgr.AcquireConnection(null);

       }

       catch(Exceptionex)

       {

       }

   }

   publicoverridevoidInput0_ProcessInputRow(Input0BufferRow)

   {

           sqlCmd.Parameters["@CustNum"].Value = Row.CustNum;

           sqlCmd.Parameters["@ContractID"].Value = Row.Contractid;

           sqlreader= sqlCmd.ExecuteReader();      

   }

   publicoverridevoidReleaseConnections()

   {

       connMgr.ReleaseConnection(sqlConn);

       sqlreader.Close();

   }

}

Thanks -NK