Ambiguous Match Found.

Does anyone know what this error means?





Ambiguous match found.





i'm using sql server 2000








here is my code





Dim con As SqlConnection = New SqlConnection





con.ConnectionString = _


"Data Source=localhost;" + _


"Initial Catalog=registeruser;" + _


"User ID=int422;" + _


"Password=int422"








Dim cmd As SqlCommand = New SqlCommand





cmd.Connection = con


cmd.CommandType = CommandType.Text


cmd.CommandText = "SELECT salt,hash FROM users WHERE login_id = '" + user.Text + "'"








Dim rdr As SqlDataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection)








con.Open()





Dim salt, hash As String











While rdr.Read()








If user.Text = rdr.Item("login_id").ToString() Then





salt = rdr.Item("salt").ToString()


hash = rdr.Item("hash").ToString()








End If








End While





con.Close()








Label1.Text = salt











End Sub