c# - ASP.Net MySqlDatabase Null Value -

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i have below code in asp.net web forms page c#,

 protected void page_load(object sender, eventargs e)         {             conn.open();             string selecttruckquery = "select * truck truck_id='" + truckid + "'";             mysqlcommand cmd = new mysqlcommand(selecttruckquery, conn);             foreach (dbdatarecord rowdata in cmd.executereader())             {                  if (!rowdata.isdbnull(rowdata.getordinal("truck_id")))                     idno.text = rowdata.getstring(rowdata.getordinal("truck_id"));                  if (!rowdata.isdbnull(rowdata.getordinal("registration_no")))                     registrationno.text = rowdata.getstring(rowdata.getordinal("registration_no"));                  if (!rowdata.isdbnull(rowdata.getordinal("make")))                     tmake.text = rowdata.getstring(rowdata.getordinal("make"));                  if (!rowdata.isdbnull(rowdata.getordinal("model")))                     tmod.text = rowdata.getstring(rowdata.getordinal("model"));                  if (!rowdata.isdbnull(rowdata.getordinal("engine_no")))                     teng.text = rowdata.getstring(rowdata.getordinal("engine_no"));                   if (!rowdata.isdbnull(rowdata.getordinal("chassis_no")))                     tchass.text = rowdata.getstring(rowdata.getordinal("chassis_no"));                   if (!rowdata.isdbnull(rowdata.getordinal("driver_name")))                     tdriver.text = rowdata.getstring(rowdata.getordinal("driver_name"));                  if (!rowdata.isdbnull(rowdata.getordinal("driver_contact_no")))                     tno.text = rowdata.getstring(rowdata.getordinal("driver_contact_no"));                  if (!rowdata.isdbnull(rowdata.getordinal("status")))                     tstat.text = rowdata.getstring(rowdata.getordinal("status"));              }             conn.close();         }

i want values mysqldatabase, getting values null mysqldatabase, i'm quite sure code correct.

all output null, supposed problem of this?

please me!

you can use parameterised query.

please try below. 

conn.open(); string selecttruckquery = "select * truck truck_id=@truckid";  mysqlcommand cmd = new mysqlcommand(selecttruckquery, conn); cmd.parameter.addwithvalue("@truckid", truckid);

convert truckid depending on datatype of field.


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