Comments by MadhuCodePro (Top 4 by date)

Insert a break point on below line
DataRow dRow=ds.Tables["joining"].Rows[0];

and move the cursor on to the ds variable.
You will see the find icon on beside of the ds variable.
Just click on the icon you can see the datatable rows.

What exception you are getting?
Can you post the details?

Are you getting records in select query?
Debug the code to check records in data table.