You should be putting code like this in the page code-behind.
In page load, set the DDL's (there are no combo boxes in standard HTML) selected item to the current month:
If Not IsPostBack Then 'You should probably do this, otherwise a change by the user will be overwritten.
txtsalmonth.SelectedIndex = DateTime.Now.month - 1 'You need to substract 1 for the 0 based DDL index.
End If
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Peter