array split function using more then one exist email name checking in sigle text filed

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ASP.NET

Hi,

I had single textbox using existing email name checking.
Functionality-wise it's working but I want more than one email name going to the text box.
I'm using array split methods but I don't get the query values.
This is my syntax:

//char[] delims = ",".ToCharArray();
        string[] tokens = txtemail.Text.Split(",".ToCharArray());
        
        foreach (var tok in tokens)
        {
            var rs =db.checkemail(tok);
            checkemailResult cemail = new checkemailResult();
            if (rs.Count()>=1)
            {
                lblemail.Text = "Email name exits";
                return;
            }
        }

checkemail is SP query(select count(*)as recordfound1 from Emailinvites where Invitation_email=@Invitation_email))and using linq dbml used getting some properties.