database - C# Listview , Data type Mismatch on insertion of record -

i want insert data database using c# below error

error:data type mismatch when try execute cmd1.executenonquery();

private void btnfirst_click(object sender, eventargs e)         {        constring =properties.settings.default.transportationconnectionstring;        con.connectionstring = constring;        system.data.oledb.oledbcommand cmd1 = new system.data.oledb.oledbcommand();        cmd1.connection = con;        cmd1.commandtext = "insert [billinggrd] ([invoiceno],[fromlocation],[tolocation],[material],[trip],[metricton],[billweight],[rate],[billamount],[grandtotal]) values (@invoiceno,@fromlocation,@tolocation,@material,@trip,@metricton,@billweight,@rate,@billamount,@grandtotal)";              for(inc=0;inc<listview1.items.count;inc++)             {                 cmd1.parameters.addwithvalue("@invoiceno", txtbilno.text);                 cmd1.parameters.addwithvalue("@fromlocation", listview1.items[inc].subitems[0].text);                 cmd1.parameters.addwithvalue("@tolocation", listview1.items[inc].subitems[1].text);                 cmd1.parameters.addwithvalue("@material", listview1.items[inc].subitems[2].text);                 cmd1.parameters.addwithvalue("@trip", listview1.items[inc].subitems[3].text);                 cmd1.parameters.addwithvalue("@metricton", listview1.items[inc].subitems[4].text);                 cmd1.parameters.addwithvalue("@billweight", listview1.items[inc].subitems[5].text);                 cmd1.parameters.addwithvalue("@rate", listview1.items[inc].subitems[6].text);                 cmd1.parameters.addwithvalue("@billamount", listview1.items[inc].subitems[7].text);                 cmd1.parameters.addwithvalue("@grandtotal", textbox1.text);                }                  con.open();                  cmd1.executenonquery();//error here datatype mismatch                  con.close();           } 

try might work you..... if not let me know comment

private void btnfirst_click(object sender, eventargs e)         {        constring =properties.settings.default.transportationconnectionstring;        con.connectionstring = constring;        system.data.oledb.oledbcommand cmd1 = new system.data.oledb.oledbcommand();        cmd1.connection = con;             for(inc=0;inc<listview1.items.count;inc++)             {                  cmd1.commandtext="";         con.open();         cmd1.commandtext = "insert [billinggrd] ([invoiceno],[fromlocation],[tolocation],[material],[trip],[metricton],[billweight],[rate],[billamount],[grandtotal]) values ('"+txtbilno.text+"','"+listview1.items[inc].subitems[0].text+"','"+listview1.items[inc].subitems[1].text+"','"+listview1.items[inc].subitems[2].text+"','"+listview1.items[inc].subitems[3].text+"','"+listview1.items[inc].subitems[4].text+"','"+listview1.items[inc].subitems[5].text+"','"+listview1.items[inc].subitems[6].text+"','"+listview1.items[inc].subitems[7].text+'")";                 cmd1.executenonquery();//error here datatype mismatch                 con.close();                  }                             }