private void btnGrind_Click(object sender, EventArgs e) { var gr = rune.FilterGrinds(Program.data.Crafts); var en = rune.FilterEnchants(Program.data.Crafts); using (var f = new GrindPreview()) { f.Rune = this.rune; f.Crafts = gr.Concat(en); f.ShowDialog(); } }