I using MSSQL and have 2 dateset in the report
the first dataset1 is without only return a record of a field (systemdate) of a table, while the second dataset2 contain a query with 2 parameter (date_start and date_end).
when user enter the parameter 1 and 2 , what i must do is , if parameter 1 less than dataset1( systemdate) then set parameter 1 = dataset1(systemdate).
Okay. So, you just need to compare the entered start parameter to the system date returned by the first dataSet? Then based on that, determine which value to show in your masterpage? If so, there are several things you could do, probably. One would be to bind the text box that you're displaying the date in your masterpage with to your systemdate dataSet. You'll have access to the data then and can compare this date and the parameter value to determine which one to show.