Better code for this?

ALTER PROCEDURE [dbo].[usp_InsertBidTree1] 	
@DID varchar(20) output,
@DocType varchar(4) output,
@NodeID int,
@ParentNodeID int,
@Name varchar(50),
@Details varchar(max),
@Type varchar(50)  

AS BEGIN 
Insert into tblBidTree(btDID,btDocType,btName,btNodeID,btDetails,btParentNodeID,btType)
values(@DID,@DocType,@NodeID,@ParentNodeID,@Name,@Details,@Type)


END 

public void InsertBidTree(TenderPreparationPL tprPL,SqlTransaction trans,SqlConnection cnn)
    {
        TenderPreparationDAL tprDAL = new TenderPreparationDAL();
        tprDAL.InsertBidTree(tprPL);
    }

SqlCommand cmd = new SqlCommand();
           SqlConnection con = new SqlConnection("Data Source=accerlap2;Initial Catalog=Tendering2;User ID=sa;Password=p@ssword;");
           con.Open();
           //cmd.Connection = cnn;
           //cmd.Transaction = trans;
           cmd.CommandType = CommandType.StoredProcedure;
           cmd.CommandText = "usp_InsertBidTree1";
           cmd.Connection = con;

           SqlParameter paraDID = new SqlParameter("@DID", SqlDbType.VarChar, 20);
           SqlParameter paraDocType = new SqlParameter("@DocType", SqlDbType.VarChar, 4);
           SqlParameter paraNodeID = new SqlParameter("@NodeID", SqlDbType.Int);
           SqlParameter paraName = new SqlParameter("@Name", SqlDbType.VarChar, 50);
           SqlParameter paraParentNodeID = new SqlParameter("@ParentNodeID", SqlDbType.Int);
           SqlParameter paraType = new SqlParameter("@Type", SqlDbType.VarChar, 50);
           SqlParameter paraDetals = new SqlParameter("@Details", SqlDbType.VarChar, 1000);

           paraDID.Direction = ParameterDirection.Output;
           //paraDID.Value = objTPRPro.btDID;
           paraDocType.Direction = ParameterDirection.Output;
           //paraDocType.Value = objTPRPro.btDocType;
           paraNodeID.Value = objTPRPro.btNodeID;
           paraName.Value = objTPRPro.btName;
           paraParentNodeID.Value = objTPRPro.btParentNodeID;
           paraType.Value = objTPRPro.btType;
           paraDetals.Value = objTPRPro.btDetails;

           cmd.Parameters.Add(paraDID);
           cmd.Parameters.Add(paraDocType);
           cmd.Parameters.Add(paraNodeID);
           cmd.Parameters.Add(paraName);
           cmd.Parameters.Add(paraParentNodeID);
           cmd.Parameters.Add(paraType);
           cmd.Parameters.Add(paraDetals);

           cmd.ExecuteNonQuery();//here is da error  like usp_InsertBidTree1 @ParentNodeID which was not supply..
           objTPRPro.btDocType = paraDocType.Value.ToString();
           objTPRPro.btDID = paraDID.Value.ToString();


           con.Close();

 public bool Save(bool IsEmail)
    {

        BidTreePL objBIDPL = new BidTreePL();
        TenderPreparationPL objTPRPL1 = new TenderPreparationPL();
        //SqlTransaction trans;
        SqlConnection cnn = new SqlConnection();
        objBIDPL.btDID = SessionManager.TPR1DID;
        objBIDPL.btDocType = SessionManager.CurrentDocType;
       // objTPRPL.btDocType = objTPRPL.btDocType;
        objBIDPL.btName = objBIDPL.btName;//for btName and other controls i want to call from data table
        objBIDPL.btNodeID = objBIDPL.btNodeID;
        objBIDPL.btParentNodeID = objBIDPL.btParentNodeID;
        objBIDPL.btType = objBIDPL.btType;
        objBIDPL.btDetails = objBIDPL.btDetails;
        TenderPreparationDAL objTPRBL = new TenderPreparationDAL();
        objTPRBL.InsertBidTree(objTPRPL1);

}