can anyone correct at issue of filling the data in gridview

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i wrote a query as.

C#

SqlDataAdapter da = new SqlDataAdapter("select users.username,groups.name from users,groups inner join users on roles.userid=users.userid inner join groups on roles.groupid=users.groupid", MAconn); 
but i am getting an error
 

System.NullReferenceException: Object reference not set to an instance of an object. at Default2.bind()

Posted 8-Sep-11 5:29am

codegeekalpha

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Dirk C De Winnaar 9-Sep-11 18:02pm

Put a break point in and step through to see what gets loaded.
Are you using a table or a DataSet?

2 solutions

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dasblinkenlight · Accepted Answer · 2011-09-08T05:38:00

Assuming that all tables have the columns referenced in your query, and IDs have the meaning implied by their names, I think this should be a working query.

SQL

select users.username, groups.name
from users
inner join roles on roles.userid=users.userid
inner join groups on roles.groupid=groups.groupid

If you get an exception, could you post more lines from the stack trace?

Kschuler · Accepted Answer · 2011-09-08T10:57:00

Solution 2

How did you setup MAconn? Did you forget to New it?

Posted 8-Sep-11 10:57am

Kschuler

Comments

codegeekalpha 9-Sep-11 6:24am

yes i forgot.. thx u kschuler