ASP.NET Chart control problem

hi ,
I am trying to create the graph shown below in asp.net using chart controls


My data table contain tw0 columns for X axis (Date Type) and Y axis (Double Type) values - ()below)

mydatatable




.aspx code 

   
         
   
   
         
           
           
           
         
   
   

vb code 

chartTest.DataSource=mydatatable
 chartTest.Series(0).XValueMember =XDate
chartTest.Series(0).YValueMembers =YValue



i am getting the graph correctly but some problems in the labels in the X axis . Its not showing anything

Now graph look this


pls help