从 Visual Studio 连接到 SQL Server 数据库的问题

Question

I've created a simple Windows Forms application in C# and now find it hard to connect it to a SQL Server database. I've created the database within Visual Studio itself. However, once I try to insert data I get a SQL exception. My guess is there is problem in the connection data source ie the con variable. Please help me find a solution.

SqlConnection con = new SqlConnection("Data Source=(LocalDB)\\MSSQLLocalDB;Initial Catalog=Database1;Integrated Security=SSPI");

SqlCommand cmd;
SqlDataAdapter adapt;

if (textBox1.Text != "" && textBox2.Text != "" && textBox3.Text != "")
{
    cmd = new SqlCommand("insert into [dbo].[user] (Id, username, password) values (@id, @name, @state)", con);

    con.Open();

    cmd.Parameters.AddWithValue("@id", textBox1.Text);
    cmd.Parameters.AddWithValue("@name", textBox2.Text);
    cmd.Parameters.AddWithValue("@state", textBox3.Text);

    cmd.ExecuteNonQuery();
    con.Close();

    MessageBox.Show("Record Inserted Successfully");
}
else 
{
    MessageBox.Show("Please Provide Details!");
}

The database file name is

\WindowsFormsApplication1\WindowsFormsApplication1\Database1.mdf

Answer 1

If you created the database on an actual instance of SQL Server (this can be a local instance on your machine), it appears as though your connection string's data source isn't quite right.

Data Source=DESKTOP-XXXXXXX/Shenal Burkey

There are two problems with this, first the slash (/) should actually be a backslash (). Second, after the slash you have 'Shenal Burkey' with a space. SQL Server instance names cannot contain space characters. That being said, if you installed SQL Server as a named instance, you need to specify the named instance in that place, if you accepted the default instance name it should be 'MSSQLSERVER'. If you are using the default instance name, you can either specify your connection string like this:

Data Source=DESKTOP-XXXXXXX\MSSQLSERVER

or you can omit the instance name entirely and just use:

Data Source=DESKTOP-XXXXXXX

Also, just a tip, you will notice I replaced the specifics of your DESKTOP's hostname with X's, personally I'd recommend editing your question and doing the same. It may not seem like it would be useful, but someone might just pick that up and find a crafty way to do some damage. Better safe than sorry.