c# - Struggling to populate datagrid from stored procedure with parameters - 


protected datatable retrievealumni2()         {             {                 mysqlconnection con = new mysqlconnection("server=100.0.0.0;user id=id;password=pass;database=db;persistsecurityinfo=true");                 mysqlcommand cmd = new mysqlcommand("get_alumni_by_city", con);                 mysqldataadapter da = new mysqldataadapter(cmd);                 datatable dt = new datatable();                 try                 {                     string city = textbox1.text;                     con.open();                     cmd.commandtype = commandtype.storedprocedure;                     cmd.parameters.addwithvalue("@city", sqldbtype.varchar).value = city;                     da.selectcommand = cmd;                     cmd.executenonquery();                     da.fill(dt);                     datagridview1.datasource = dt;                 }                 catch (system.exception ex)                 {                     messagebox.show(ex.message);                 }                                 {                     cmd.dispose();                     con.close();                 }                 return dt;             }         }

giving error:

"input string not in correct format"

city varchar in mysql server. appreciated.

have tried this?

cmd.parameters.addwithvalue("@city","" + city + "");

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