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How To Check If Data Already Exists In Database?

I was able to get this code to work but now I get a SQL error if you try to submit the same information twice. 
How can I add a message saying that the "email" already exists in database without the SQL error?

    protected void Button1_Click1(object sender, EventArgs e)
        SqlConnection conn =
            new SqlConnection("Data Source=TECATE;Initial Catalog=subscribe_mainSQL; User Id=maindb Password=123456; Integrated Security=SSPI");
        SqlCommand cmd = new SqlCommand("INSERT INTO [main] (, [userid], [fname], [lname], [degree]) VALUES (@email, @userid, @fname, @lname, @degree)", conn);
            cmd.Parameters.AddWithValue("@email", email.Text);
            cmd.Parameters.AddWithValue("@userid", uscid.Text);
            cmd.Parameters.AddWithValue("@fname", fname.Text);
            cmd.Parameters.AddWithValue("@lname", lname.Text);
            cmd.Parameters.AddWithValue("@degree", degree.SelectedItem.Value);

            int i = cmd.ExecuteNonQuery();


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