I want lunche a text sharing website with asp.net and sql


How do I avoid sending duplicate text from the users

I want lunche a text sharing website with asp.net and sql


How do I avoid sending duplicate text from the users

Please clarify your question

Users can send text for example short text , sms,. I want when one users sending the text , other users can not sending the similar texti want the code that check the text and find the similar text