how to check if an email address already exists in the database in asp.net

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In this article we can see how to find exiting email id from data base and it will display error message if it already exits
We created a method with name uniqueEmail.
Established a connection to the database.
Getting the data from the table  aspnet_Membership.
Using the ExecuteReader to read the values and checking the condition weather email id is already exists or not.

   public bool uniqueEmail()
        {
            
                string iemail;
                string constr = ABCDataAccessLayer.ABCConnctionString; // connection string
                SqlConnection con = new SqlConnection(constr);
                con.Open();
                string query = "select count(Email) as Email  from aspnet_Membership where Email= '" + txtEmailID.Text + "'";
                SqlCommand cmd = new SqlCommand(query, con);
                SqlDataReader dr;
                dr = cmd.ExecuteReader();
                while (dr.Read())
                {
                    iemail = dr["Email"].ToString();
                    if (iemail != "0")
                    {
                        mailerror.Text = "Enter different email id";
                        return false;
                    }
                   
                }

                return true;
            
        }

Keep if condition,if you want to check email in insert mode or update mode
if (uniqueEmail())
{
Insert Code logic //
or
Update Code Logic
}

Output:

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