Add dataset using Add New >> Dataset and configure it.
Then in the namespace of the forms, add reference as
Imports DemoApplication.dsArticlesTableAdapters
Demoapplication is the name of your application and dsArticles is the name of added DataSet.
Then in the button, where you want to access the dataset and table, add code:
Dim ta As New tblArticlesTableAdapter()
Dim dt As dsArticles.tblArticlesDataTable = ta.GetData(txtArtNo.Text)
MsgBox(dt.Rows.Count)