Money in sql server 2000 with ASP.NET 2.0

I have a table with a field of type money.
This field gets its currency according to the culture and I format
It in a formview to show the currency symbol:
<asp:TextBox ID="AmountTextBox" runat="server" Text='<%# Bind("Amount", "{0:C}") %>'></asp:TextBox>
When I update this field I get an error:
Input string was not in a correct format.
I update with the following command:

UPDATE Candidate SET Amount = CONVERT (money, @Amount)  WHERE (Candidate_id = @Candidate_id)

If I run the following script in sql query analyzer with a value of $300 it run and update OK. If I put it into a stored procedure and run it - its OK
If I run the store procedure with open in sql query analyzer it gives an error:
Invalid value..
What is the problem here?
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ANAT2403Author Commented:
I found the solution to remove the currency symbol before the updating with the parsing command:
       Decimal tempdec = Decimal.Parse(temp22.Text, System.Globalization.NumberStyles.Currency);
I I had $300 I now have 300.

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