Why if i use the following instruction in the code behind:
SqlDataSource1.SelectParameters["page"].DefaultValue = "0";
I get 'System.NullReferenceException: Object reference not set to an instance of an object.
'?
2 Answers
The only two objects involves in that single statement are (bold)
SqlDataSource1.SelectParameters["page"].DefaultValue
SqlDataSource1.SelectParameters["page"].DefaultValue
So one of them must be null. When looking at this together with your previous question, it is because you have not yet added the "page" parameter to SqlDataSource1.
answered Feb 9, 2011 at 20:19
Either your SqlDataSource object is null or its SelectParameters collection doesn't have an entry for "page". Check that you have defined that select parameter appropriately.
answered Feb 9, 2011 at 20:20
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Parameter must be one of Control, Cookie, Form, Profile, QueryString, Session or Route. Since I didn't create a session variable or a cookie I didn't try those. I tried the others and they all failed. How do I create the parameter?Nate– Nate08/24/2018 20:09:03Commented Aug 24, 2018 at 20:09
SqlDataSource1.SelectParametersvalid (!= null)?? IsSqlDataSource1.SelectParameters["page"]valid (!= null)?? This is just very basic debugging....