System.IndexOutOfRangeException: price

Hi Experts

I hope some of you can assist me in this.
My webapplication (asp.net/c#) works like a charm on localhost. But when I put it out on the server I get a server error saying System.IndexOutOfRangeException: price
Highlighted piece of code: "string pris = rdrVarer["pris"].ToString().Replace(",0000", ".00");"

This happens when I click the button to move the items in the basket and place them in the orders table

Can anyone please point me in the right direction here because I don't know what to look for

This is the code behind for this particular button:

// move data from hk to orders
 
                    SqlCommand sqlHentvarer = new SqlCommand("select vare_id,cast(pris as numeric(10,2)),storrelse,antall from hk where session_id ='" + Session.SessionID + "'", sqlConn);
 
                    SqlDataReader rdrVarer = sqlHentvarer.ExecuteReader();
 
                    // make loop 
 
                    while (rdrVarer.Read())
                    {
                        // norwegian vs english configuration
 
                        string pris = rdrVarer["pris"].ToString().Replace(",0000", ".00");
                        
 
                        SqlCommand sqlSettinnOrdre = new SqlCommand("insert into ordrelinjer (ordre_id,vare_id,pris,storrelse,antall) values ("
                                                                + OrdreID + "," + rdrVarer["vare_id"] + "," + pris
                                                                + "," + rdrVarer["storrelse"] + rdrVarer["antall"] + ")", sqlConn);
 
                        sqlSettinnOrdre.ExecuteNonQuery();
 
 
                    }

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