how to create crystal report from session

If you give brief detail of your question. we can understand it better.
----------------------------------------------------------------------
but as for your this question:-

save the data retrieved from session in an varaible.

use the parameters in crystal reports for text fields and parameters fields.

Try this code for showing the data in parameters:-

Declarative :-

using CrystalDecisions.CrystalReports.Engine;
using CrystalDecisions.Shared;
using CrystalDecisions.Windows.Forms;
using CrystalDecisions.ReportSource;

code part:-

Objects Declarations:-

ParameterFields paramFields = new ParameterFields();
ParameterField paramField;
ParameterDiscreteValue paramDiscreteValue;
Inq_Report2 objRpt;

use this function:-

'int i' refers to parameters no., and 'string e' refers to the value which you want to show.

public void runtime_param(int i, string e)
       {
           paramField = new ParameterField();
           paramField.Name = "col" + i.ToString();
           paramDiscreteValue = new ParameterDiscreteValue();
           paramDiscreteValue.Value = e;
           paramField.CurrentValues.Add(paramDiscreteValue);
           //Add the paramField to paramFields
           paramFields.Add(paramField);
       }

on
void button1_click()
{
runtime_param(3, "session data");
crystalReportViewer1.ParameterFieldInfo = paramFields;
where 'ds' is a dataset if you want to use.

objRpt.SetDataSource(ds);
            crystalReportViewer1.ReportSource = objRpt;
            con.Close();

}

-------------------------------------------------------------------------------

if you have any problem just tell.
Good Regards for your problem.