in trigger how to take the previous values

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ADO.NET

I am facing a issue like if my table is like
DATABASE NAME:DB2
ID Name Price Date

1 mango 12 2/2/2012
2 banana 31 1/2/2012
3 fruit 100 3/1/2012

if i try to alter the content(DML OPERATION) of the current table where a trigger must occur and in my other database it should save as WHERE i am trying the alter the price column

DATABASE NAME:DB3

ID Price Date

1 12 2/2/2012
2 31 1/2/2012
3 100 3/1/2012

thanks in advance