The ConnectionString property has not been initialized
Hello good day I'm programming in C # I have a method that I show below, but it throws me an error that says
An unhandled exception of type 'System.InvalidOperationException ' occurred in System.Data.dll Additional information: ConnectionString{[2] property has not been initialized]}
I really can't find the error if anyone can help me I would really appreciate it.
public static bool Conectar()
{
bool conectado = false;
conexion = new SqlConnection(cadenaConexion);
try
{
conexion.Open();
conectado = true;
}
catch (SqlException ex)
{
errorconexion = ex.Message;
}
return conectado;
}
3 answers
I would recommend that you do the following:
In your web config
<connectionStrings>
<add name="DBConnStr" connectionString="server=127.0.10.31;database=Example;UID=admin;PWD=123456" providerName="System.Data.SqlClient"/>
</connectionStrings>
And I would also recommend that you use so your variable, more than a method as such, define a variable within your class, service or whatever, I will assume that it is a service
namespace MiNameSpace
{
public class IServiceTopStore : IIServiceTopStore
{
public static string Db = (ConfigurationManager.ConnectionStrings["DBConnStr"].ConnectionString);
public static bool Conectar()
{
bool conectado = false;
SqlConnection conexion = new SqlConnection(Db);
try
{
conexion.Open();
conectado = true;
}
catch (SqlException ex)
{
errorconexion = ex.Message;
}
return conectado;
}
}
}
Of course, all this thinking that you have some wcf web application, or a ws as such, but if it is not the case it is not easier than:
public class MiClase
{
public static string Db = "server=127.0.10.31;database=Example;UID=admin;PWD=123456"
public static bool Conectar()
{
bool conectado = false;
SqlConnection conexion = new SqlConnection(Db);
try
{
conexion.Open();
conectado = true;
}
catch (SqlException ex)
{
errorconexion = ex.Message;
}
return conectado;
}
}
If you have a method that inicializa your string variable of Conexion , you should call it before performing SqlConnection otherwise, that variable will have no value
public static void inicializar() {
cadenaConexion = "SERVER=127.0.10.31;DATABASE=Example;User id=admin; Password=123456;"
}
public static bool Conectar()
{
bool conectado = false;
inicializar(); /*Dar valores a tu cadena de conexion*/
conexion = new SqlConnection(cadenaConexion);
try
{
conexion.Open();
conectado = true;
}
catch (SqlException ex)
{
errorconexion = ex.Message;
}
return conectado;
}
I recommend you use a SqlConnectionStringBuilder:
SqlConnectionStringBuilder builder =
new SqlConnectionStringBuilder(connectString);
// Supply the additional values.
builder.DataSource = dataSource;
builder.UserID = userName;
builder.Password = userPassword;
Console.WriteLine(builder.ConnectionString);
Use the string I give you with the correct data because you have a formatting error, I think it's in User id.
You can view the documentation you need on the developer network site.