Hi,
Add all the strings into the string builder and copy the text into Clipboard
StringBuilder sb = new StringBuilder();
sb.Append(labelText.Text);
sb.Append(label1.Text);
sb.Append(label2.Text);
Clipboard.Clear();
Clipboard.SetText(sb.ToString());
string s = Clipboard.GetText();
You can also combine two string, check below
sb.AppendLine("Phone Number :" + "[your number]");
Best Regards
Muthuraja