System.NullReferenceException: Object reference not set to an instance of an object

Question

System.NullReferenceException: Object reference not set to an instance of an object

Navigation

#1 by (0 votes)

1

I'm developing a project in asp.net, where I'm trying to do this insertion in the database. But when I try to perform this command, it ends up saying this error message: "System.NullReferenceException: Object reference not set to an instance of an object."

[WebMethod]
public void InsertUsuario(string usuario, string senha, string nome, string dtnasc, string fone, string email, int oab, string endereco, string bairro, string cep, int codcidade, string cpf, string cnpj)
{
            using (SqlConnection conn = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString))
            {
                string chav = "asfasdf";
                DateTime dateFromString = DateTime.Parse(dtnasc, System.Globalization.CultureInfo.InvariantCulture);
                SqlCommand command = new SqlCommand("INSERT Into Usuarios (IdUsuario, Usuario, Senha, Nome, Chave, DtNasc, Fone, Email, OAB, Endereco, Bairro, CEP, CodCidade, CPF, CNPJ) VALUES ((Select MAX(idusuario)+1 from Usuarios), '" + usuario + "', '" + senha + "', '" + nome + "', '" + chav + "', '"+dateFromString+"', '" + fone + "', '" + email + "', " + oab + ", '" + endereco + "', '" + bairro + "', '" + cep + "', " + codcidade + ", '" + cpf  + "','"+cnpj+"')");
                Console.WriteLine(dateFromString.ToString());
                conn.Open();
                command.ExecuteNonQuery();

            }
}

This is the created bank:

Create table Usuarios (
IdUsuario              int  not null,
Usuario                varchar(30) not null,
Senha                  varchar(30) not null,
Nome                   varchar(50) not null,
Chave                  varchar(18) not null,
DtNasc                 date null,
Fone                   varchar(15) not null,
Email                  varchar(70) null,
OAB                    int null,
Endereco               varchar (100) null,
Bairro                 varchar (80) null,
CEP                    varchar (9) null,
CodCidade              int null,
CPF                    varchar (20) null,
CNPJ                   varchar (20) null
primary key (IdUsuario)
)

Error message:

System.InvalidOperationException: ExecuteNonQuery: propriedade Connection n&#227;o foi inicializada. em System.Data.SqlClient.SqlCommand.ValidateCommand(String method, Boolean async) em System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(Tas‌kCompletionSource'1 completion, String methodName, Boolean sendToPipe, Int32 timeout, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry) em System.Data.SqlClient.SqlCommand.ExecuteNonQuery()

sql asp.net web-service

asked by anonymous 14.07.2017 / 19:25

1 answer

How to insert in 3 tables at the same time? (PHP + Mysql) I have a problem to search for objects inside objects

score 0 · Answer 1

You are not assigning the connection to the command,

Try to do so:

string sql = @"INSERT Into Usuarios (IdUsuario, Usuario, Senha, Nome, Chave, DtNasc, Fone, Email, OAB, Endereco, Bairro, CEP, CodCidade, CPF, CNPJ) VALUES ((Select MAX(idusuario)+1 from Usuarios), '" + usuario + "', '" + senha + "', '" + nome + "', '" + chav + "', '"+dateFromString+"', '" + fone + "', '" + email + "', " + oab + ", '" + endereco + "', '" + bairro + "', '" + cep + "', " + codcidade + ", '" + cpf  + "','"+cnpj+"')";


string chav = "asfasdf";
DateTime dateFromString = DateTime.Parse(dtnasc, System.Globalization.CultureInfo.InvariantCulture);
SqlCommand command = new SqlCommand(sql, conn);
Console.WriteLine(dateFromString.ToString());
conn.Open();
command.ExecuteNonQuery();