Exception has been thrown by the target of an invocation in wpf application

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I have written a simple wpf application for binding data in datagrid. It throws error while running at following line.

string ConString = System.Configuration.ConfigurationManager
.ConnectionStrings["ConString"].ToString();
Exception shows: Exception has been thrown by the target of an invocation."

InnerException:{"Object reference not set to an instance of an object."}

Posted 10-Mar-13 23:43pm

Nilesh Ranjan

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Abhinav S · Answer 1 · 2013-03-10T23:51:00

Solution 1

.ConnectionStrings["ConString"] seems to be null.
When you use ToString() over a null you get this error.

Check if you have passed in the right argument and that there are values inside ConnectionStrings.

Posted 10-Mar-13 23:51pm

Abhinav S