I created connection string:

```
connection.ConnectionString = @"Provider=abcdef; Server=123....; Database=abc; User Id=user; Password=xyz"; 

```

It works very well. I want to exchange password with variable:

```
connection.ConnectionString = @"Provider=abcdef; Server=123....; Database=abc; User Id=user; Password="+textBox1.Text;

```

My program shows error:

> 
> Login failed for user: user... (textBox.Text = "xyz")
> 
> 
> 

Do you know how to exchange password with variable correctly?