private void button3_Click(object sender, EventArgs e) { DataView dtv = new DataView(); EnumerableRowCollection <DataRow> query = from Button1 in dtb.AsEnumerable() where Button1.Field <string>("ID") == "1001" orderby Button1.Field <string>("NET") select Button1; DataView view = query.AsDataView(); dataGridView2.DataSource = view; DataTable showtable = view.ToTable("1001"); foreach (DataRow row in showtable.Rows) { if (row["Selected"].Equals(true)) { richTextBox1.AppendText("\nBUTTON3: " + row["PATH"]); } } }