Check Duplicate Name

I have a signup form.

I would like to be able to check for duplicate entries during the signup.

E.g. Check for duplicate
1. Usernames
2. Phone numbers

How could this be achieved ?

My code basically is two fold.

1. A recordset that checks
if not recordset.bof and not recordset.eof then
'do something. And redirect to say the value exists
end if

2. Run a SP to do an insert and authentication

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Duplicate Username Check

When I use this bit of code it displays the error if the username exists and if it doesn't!

If rspuafo.EOF and rspuafo.BOF Then
Response.Redirect ("thankyou.asp")
Response.End
Else

strError = "Username already exists, please choose another one" & vbNewLine

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when i want to insert my data into my table but i encounter the following error

Error Type:

Microsoft OLE DB Provider for SQL Server (0x80040E2F)
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/fsearch/InsertTable.asp, line 153

sql = "Insert into sDetail values('" & semyear & "','" & sem & "','" _
& modulecode & "','" & tutorial & "','" _
& semday & "','" & startTime & "','" _
& endTime & "','" & location & "','" _
& roomno & "','" & tutor & "')"

oConn.execute sql 'line 153

how to solve this error can anyone help ?

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Error Type:
Microsoft OLE DB Provider for ODBC Drivers (0x80040E14)
[Microsoft][ODBC Microsoft Access Driver] The changes you requested to the table were not successful because they would create duplicate values in the index, primary key, or relationship. Change the data in the field or fields that contain duplicate data, remove the index, or redefine the index to permit duplicate entries and try again.
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<%
set conn=server.createobject("adodb.connection")
conn.Open "Driver={SQL Server}; Server=SERVERNAME; Database=DATABASENAME; UID=USER; PWD=PASSWORD"
set rs = Server.CreateObject("ADODB.RecordSet")

strTitle = Replace(request.Form("title"), "'", "&#39")
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strSQL = "INSERT INTO [webPages] ([created], [section], [title], [content]) Values ('" & now() & "','" & request.Form("section") & "','" & strTitle & "','" & strContent & "')"
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%>

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