مشكلة قي عرض Datagridview

اخي الكريم في form_load ضع الكود التالي

DataGridView1.DataSource = DataSet1.Tables("merchanttbl")

merchanttbl هو اسم الجدول

أستخدم هذا الكود

 DataGridView1.DataSource = Nothing

   Dim sql As String = "select * from name_table  "
			Dim dataset1 As DataSet
			Dim con As New SqlConnection
			Dim new1 As SqlDataAdapter
			Dim s As SqlCommand
			new1 = New SqlDataAdapter
			dataset1 = New DataSet
			con.ConnectionString = "Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Database1.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True"
			s = New SqlCommand(sql, con)
			new1.SelectCommand = s
			new1.TableMappings.Add("Table", "name_table")
			con.Open()

			Try
				new1.Fill(dataset1)
				con.Close()
			Catch ex As Exception

			End Try
			DataGridView1.DataSource = dataset1
			DataGridView1.DataMember = "name_table"