As per your question i guess the following code snippet will help you
Check the grid textmatrix...
if it is blank then no data...
example:
For i = 1 To vsflexgrid.Rows - 1
if (vsflexgrid.TextMatrix(i, 0) = "") then
msgbox("No Data")
else
msgbox("Data Present")
endif
Next i
Hope this will solve your query...