I am trying to get Database Data to insert into List View
Error Code:
Unhandled Exception:
System.NullReferenceException: Object reference not set to an instance of an object. occurred
UPDATE 1:
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CodePlague
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1please DON'T post code as images. Take the time to post your code as properly formatted text. – Jason May 18 '17 at 12:51
2 Answers
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Either shMsg or sqldb is null.
Bertus van Zyl
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Do you ever set that property to anything? If you but a breakpoint on the setter, does it ever get hit? – Bertus van Zyl May 18 '17 at 12:11
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This is really basic stuff. You need to learn c# basics first. https://www.tutorialspoint.com/csharp/csharp_properties.htm – Bertus van Zyl May 18 '17 at 12:16
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Put a breakpoint on line shMsg = FindViewById<TextView> (Resource.Id.shMsg);Then check if your resource is filled, and if you step 1 execution further, if the variable shMsg has a value.
Then proceed stepping until you realise which object has a null value.
The reason you get this exception is because you're trying to get a property of something that doesn't exist, because it's null.
If the sqldb variable is null, make sure you don't dispose of the connection to the database prematurely, which is a common mistake.
Glubus
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The breakpoint at `shMsg = FindViewById
(Resource.Id.shMsg);` is null from the beginning – CodePlague May 18 '17 at 12:15 -
Which value is null? When you hit the breakpoint, or when the exception is thrown, you can mouseover variables and check their values set. – Glubus May 18 '17 at 12:24