Login failed for user ''. error - vb.net

Question

I know that this is a duplicate post but I couldn't find my solution on that topics. I want to connect my sql file in debug folder but I got error that Login failed for user ''.
Dim connectionString As String = String.Format("Data Source=.\SQLEXPRESS;AttachDbFilename={0}\Word.mdf;Integrated Security=False;Connect Timeout=30;User Instance=True", My.Application.Info.DirectoryPath)
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Dim sql As String = "SELECT * FROM test"
Dim connection As New SqlConnection(connectionString)
Dim dataadapter As New SqlDataAdapter(sql, connection)
Dim ds As New DataSet()
connection.Open()
dataadapter.Fill(ds, "test_table")
connection.Close()
DataGridView1.DataSource = ds
DataGridView1.DataMember = "test_table"
MakePivot()
connection.Close()
DataGridView2.ClearSelection()
End Sub
Could you tell me my mistake please?

Answer 1

Dim ds As New DataSet()
Using connection As New SqlConnection(String.Format("Data Source=.\SQLEXPRESS;AttachDbFilename={0}\Word.mdf;Integrated Security=true;Connect Timeout=30;User Instance=True", My.Application.Info.DirectoryPath))
connection.Open()
Using command As New SqlCommand("SELECT * FROM test", connection)
command.CommandTimeout = 0
Using da As New SqlDataAdapter(command)
da.Fill(ds)
End Using
End Using
End Using
DataGridView1.DataSource = ds
MakePivot()
DataGridView2.ClearSelection()
Try this code, need to set "integrated security=true"