Database already exist. Choose a Different Name using CreateDatabase()

Question

I got an issue and learned something at the same time....

I created a DBML from an existing server database.

From the DBML I wanted to create local database

Answer 1

A solution (via here) is to use SSEUtil to detach the existing db:

try
{
    // open a connection to the database for test
}
catch (SystemException ex) // Change exception type based on your underlying data provider
{
    if (ex.Message.ToLower().Contains("already exists. choose a different database name"))
    {
        var match = Regex.Match(ex.Message, "database '(.*)' already exists.", 
           RegexOptions.IgnoreCase);

        if (match.Success)
        {
            String dbFileName = match.Groups[1].Value;
            Process p = new Process();
            p.StartInfo.UseShellExecute = true;
            p.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
            p.StartInfo.FileName = String.Format("{0}/Tools/SSEUtil.exe", 
              Environment.CurrentDirectory);
            p.StartInfo.WorkingDirectory = Environment.CurrentDirectory;
            p.StartInfo.Arguments = String.Format("-d \"{0}\"", dbFileName);

            p.Start();
        }
    }
}

Answer 2

Here's a quick fix for a localDB mess. Just connect to (localdb)\MSSQLLocalDB in SQL Mgmt. Studio/Visual Studio.

Then delete the offender, checking "Close existing connections"

Answer 3

You need to open master database via server explorer in Visual Studio (Add New Connection + Select master database) then add a New query, type Drop Database xxxx and execute it. You can also use Sql Server Management Studio.

Answer 4

I also actually had this same problem. Previously, I deleted (cut) the database in mysqlserver2012 and copied it to my application folder. After I made my app I got this error, and solved it by removing the Initial Catalog part of my Connection String.

Your final connection string should look something like this:

Data Source=<your server name>;AttachDbFileName=database path\databaseName.mdf;Integrated Security=True" + ";User Instance=True" + ";Context Connection=False;