I can repeat my prob from many project so I'm doing something wrong. I think it's my `connectionstring` but I'm not sure. My database was created in `vistual studio 2013`. Thanks in advance for your help!

Here my connectionString: 

```
`Data Source=(LocalDB)\v11.0;AttachDbFilename="C:\Users\user\Documents\Visual Studio 2013\Projects\ConnectLocalData\Database1.mdf";Integrated Security=True;Connect Timeout=30`

```

And the code:

```
SqlConnection Yop = new (SqlConnection(customersTableAdapter.Connection.ConnectionString);
            Yop.Open();
            SqlCommand sqlcmd = new SqlCommand("INSERT INTO Customers (CustomerID, CompanyName, ContactName, Phone) Values (@CustomerID,@CompanyName, @ContactName, @Phone)", Yop);
            sqlcmd.Parameters.AddWithValue("@CustomerID", textBox1.Text);
            sqlcmd.Parameters.AddWithValue("@CompanyName", textBox2.Text);
            sqlcmd.Parameters.AddWithValue("@ContactName", textBox3.Text);
            sqlcmd.Parameters.AddWithValue("@Phone", textBox4.Text);
            sqlcmd.ExecuteNonQuery();
            Yop.Close();

```