Just make sure the text box is set to multi-line:
StringBuilder sb = new StringBuilder(); sb.AppendLine(string.Format("Network adapter: {0}", adapters[i].Name)); sb.AppendLine(string.Format(" Status: {0}", adapters[i].OperationalStatus.ToString())); sb.AppendLine(string.Format(" Interface: {0}", adapters[i].NetworkInterfaceType.ToString())); sb.AppendLine(string.Format(" Description: {0}", adapters[i].Description)); sb.AppendLine(string.Format(" ID: {0}", adapters[i].Id)); sb.AppendLine(string.Format(" Speed: {0}", adapters[i].Speed)); sb.AppendLine(string.Format(" SupportsMulticast: {0}", adapters[i].SupportsMulticast)); sb.AppendLine(string.Format(" IsReceiveOnly: {0}", adapters[i].IsReceiveOnly)); sb.AppendLine(string.Format(" MAC: {0}", adapters[i].GetPhysicalAddress().ToString())); textBox1.Text = sb.ToString();
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