Dynamically genearting Crystal reports

Hi every one,

         I'm new to crystal reports.I've got one requirement like , i've to write one C# function  in which dynamically i've to generate the reports.

       I dont want to design sepearte .rpt files for individual reports.I'll design one .rpt file that i'll load while generating the report.But in each & every reports number of columns will vary.So in design time how to set the dataset to the .rpt file.

Run time i'll pass a datatable to the report.....based on the input datatable's columns....report should be generated. Also , i want to set the report header,footer,logo,header column names, header font...etc using C# code.

please give me suggestions to do this.