备份数据库

Question

I want to backup my DB but I got a error:

ConnectionStrings cannot be used like a method

How can I resolve this?

string strCon = @"Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\Database.mdf;Integrated Security=True;User Instance=True";
string sSQL = "BACKUP DATABASE Database TO DISK = 'D:\\Database.bak';";
using (SqlConnection connection = new SqlConnection(ConfigurationManager.Connectionstrings(strCon).ConnectionString)) 
{
    SqlCommand command = new SqlCommand(sSQL, connection);
    connection.Open();
    command.ExecuteNonQuery();
}

Answer 1

You should directly use that variable as SqlConnection requires a string object containing a connection string and you are storing it in a string object itself.

So it would be simply like this:

using (SqlConnection connection = new SqlConnection(strCon)) 
{
    SqlCommand command = new SqlCommand(sSQL, connection);
    connection.Open();
    command.ExecuteNonQuery();
}

Recommended: (to store it in Web.config )

<connectionStrings>
        <add name="job" connectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\Database.mdf;Integrated Security=True;User Instance=True" />
</connectionStrings>

Then access it like this: ( using System.Configuration; )

ConfigurationManager.ConnectionStrings["job"].ConnectionString

Answer 2

ConnectionStrings is a collection. It must be used like:

ConfigurationManager.Connectionstrings[0].ConnectionString