How to display amount values with just a decimal point, comma seperators and a leading hyphen for negative values but with no dollar sign in a GridView in ASP.NET?

I am developing my first ASP.NET application in C# using VS2010.

I placed a (Data) GridView control on a Web Form.

For one of the fields titled AMT, this field that has an amount value and I just
want it to display the "Decimal point" and "Comma separator" as the DataFormatString.
How would I display the field in the GridView with just a decimal point and (thousands) comma separator. I don't want the dollar sign. And for negative amounts,  I want to precedie the amount with a dash.

For ex:

-80,000.00
        33.12
zimmer9Asked:
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Chinmay PatelConnect With a Mentor Enterprise ArchitectCommented:
 int result = -80000;
 string value = result.ToString("N2");

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Source: http://stackoverflow.com/questions/1048643/format-a-double-value-like-currency-but-without-the-currency-sign-c
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zimmer9Author Commented:
After dragging the GridView control from the Data section of the Tool Box onto my web form, I am trying to put a value into the "DataFormatString" field ofthe Smart Tag of the GridView control to convert a number into proper formatting.

The formatting I want is to put a dash in front of a negative number
and place a decimal point and (thousands) comma separator into a numeric value.

Thus, if the GridView row field is pulling from a database a value of 64786, the amount would be displayed in the GridView as 64,786.00

And if the GridView row field pulls in from a database a value of -221, it would appear in the GridView as -221.00.

The GridView field amount field is stored in default.aspx as follows:

If the GridView control cannot handle this editing "AMOUNT" field, then can the following ASPX CODE be modified to handle the reformatting of the AMOUNT field?

<asp:BoundField DataField="amount" HeaderText="Amount" SortExpression="amount" />
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