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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 11-Mar-13 0:43am

1 solution

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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.
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