c# - UpdateCommand not working? -

so have code stores update query in string, parameter bind update query , execute , update it, code:

string query = "update users set first_name = '@firstname' id = @id"; updateuserds.updateparameters.add("id", httpcontext.current.session["columnid"].tostring()); updateuserds.updateparameters.add("firstname", txt_firstname.text); updateuserds.updatecommand = query;  updateuserds.update(); 

however when change string query to:

string query = "update users set first_name = 'name' id = 44"; 

it works , updates table, guessing how have binded query, realise have gone wrong?

btw: session["columnid"] being retrieved states 44 in stack trace

remove single quotes @firstname:

string query = "update users set first_name = @firstname id = @id"; updateuserds.parameters.addwithvalue("@firstname", first_name); updateuserds.parameters.addwithvalue("@id", httpcontext.current.session["columnid"].tostring()); 

edit:

assuming using sql server database try this:

sqlcommand sqlcomm = new sqlcommand(); sqlcomm.commandtext = @"update users set first_name = @firstname id = @id"; sqlcomm.parameters.add("@firstname", sqldbtype.varchar); sqlcomm.parameters["@firstname"].value = txt_firstname.text; sqlcomm.parameters.add("@id", sqldbtype.varchar); sqlcomm.parameters["@id"].value = httpcontext.current.session["columnid"].tostring();      using (sqlconnection sqlconn = new sqlconnection(connection string here);) {     sqlcomm.connection = sqlconn;     sqlconn.open();     sqlcomm.executenonquery(); }