strange error report calling from asp.net....please

[msdotnet]

hi guyes,

Iam so strange about this syntax problem in asp.net calling crystal report from aspx page

dim strdate as datetime
strdate = selectdate

rpt1.selectionformula = "{table1.personid}=" & personid & "and {table1.mydate}='" & strdate.Tostring("yyyy.M.d.hh.mm.ss&quot & "'"

in the above code its showing an error like

error in formula and date-time is required..

Please help me to getout from this error...
thanks