entity framework - Unable to initialize database -


i unable iniitialize database. steps simple explained here. here. error not explainatory guess something wrong around connection string couldn't figured out. can please see me.

error

" @ system.data.common.dbconnectionoptions.getkeyvaluepair(string connectionstring, int32 currentposition, stringbuilder buffer, string& keyname, string& keyvalue)\r\n

at system.data.common.dbconnectionoptions.parseinternal(dictionary2 parsetable, string connectionstring, boolean buildchain, dictionary2 synonyms)\r\n t system.data.common.dbconnectionoptions..ctor(string connectionstring, dictionary2 synonyms)\r\n @ system.data.sqlclient.sqlconnectionstring..ctor(string connectionstring)\r\n @ system.data.sqlclient.sqlconnectionfactory.createconnectionoptions(string connectionstring, dbconnectionoptions previous)\r\n @ system.data.providerbase.dbconnectionfactory.getconnectionpoolgroup(dbconnectionpoolkey key, dbconnectionpoolgroupoptions pooloptions, dbconnectionoptions& userconnectionoptions)\r\n @ system.data.sqlclient.sqlconnection.connectionstring_set(dbconnectionpoolkey key)\r\n @ system.data.sqlclient.sqlconnection.set_connectionstring(string value)\r\n @ system.data.sqlclient.sqlconnection..ctor(string connectionstring)\r\n @ microsoft.entityframeworkcore.storage.internal.sqlserverconnection.createdbconnection()\r\n @ microsoft.entityframeworkcore.internal.lazyref1.get_value()\r\n
@ microsoft.entityframeworkcore.storage.relationalconnection.open(boolean errorsexpected)\r\n @ microsoft.entityframeworkcore.storage.internal.sqlserverdatabasecreator.<>c__displayclass18_0.b__0(datetime giveup)\r\n @ microsoft.entityframeworkcore.executionstrategyextensions.<>c__displayclass12_02.<execute>b__0(dbcontext c, tstate s)\r\n @ microsoft.entityframeworkcore.storage.internal.sqlserverexecutionstrategy.execute[tstate,tresult](tstate state, func3 operation, func3 verifysucceeded)\r\n @ microsoft.entityframeworkcore.executionstrategyextensions.execute[tstate,tresult](iexecutionstrategy strategy, func2 operation, func2 verifysucceeded, tstate state)\r\n t microsoft.entityframeworkcore.executionstrategyextensions.execute[tstate,tresult](iexecutionstrategy strategy, tstate state, func2 operation)\r\n @ microsoft.entityframeworkcore.storage.internal.sqlserverdatabasecreator.exists(boolean retryonnotexists)\r\n @ microsoft.entityframeworkcore.storage.internal.sqlserverdatabasecreator.exists()\r\n @ microsoft.entityframeworkcore.storage.relationaldatabasecreator.ensurecreated()\r\n @ microsoft.entityframeworkcore.infrastructure.databasefacade.ensurecreated()\r\n @ ifs.toolsuite.dataaccess.dbinitializer.initialize(toolsuitecontext context) in c:...........\dbinitializer.cs:line 12\r\n @ ifs.toolsuite.startup.program.main(string[] args) in c:\......startup\program.cs:line 27"

program.cs

    public static void main(string[] args)     {         var host = buildwebhost(args);          using (var scope = host.services.createscope())         {             var services = scope.serviceprovider;             try             {                 var context = services.getrequiredservice<testcontext>();                 dbinitializer.initialize(context);             }             catch (exception ex)             {                 var logger = services.getrequiredservice<ilogger<program>>();                 logger.logerror(ex, "an error occurred while seeding database.");             }         }         host.run();      }  public static iwebhost buildwebhost(string[] args) =>     webhost.createdefaultbuilder(args)         .usestartup<startup>()         .build();

startup.cs

public void configureservices(iservicecollection services) {     // add framework services.     services.adddbcontext<testcontext>(options =>         options.usesqlserver(configuration.getconnectionstring("applicationdb")));      services.addmvc(); }

dbintitializer.cs

public static class dbinitializer {     public static void initialize (testcontext context)     {         context.database.ensurecreated();         devcoredataseed.initialize();     } }  appsettings.json {   "connectionstrings": {     "applicationdb": "server=.\\sqlexpress;database=testdb;trusted_connection=true;multipleactiveresultsets=true"   },   "logging": {     "includescopes": false,     "debug": {       "loglevel": {         "default": "warning"       }     },     "console": {       "loglevel": {         "default": "warning"       }     }   } }


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