samedi 15 août 2015

Receiving error Object reference not set to an instance of an object? [duplicate]

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I have defined a class "Seller" in this I am using a public string variable as

public string _connectionString = ConfigurationManager.ConnectionStrings["seller"].ConnectionString.ToString();

The above connection string is defined in App.config file used in class library Seller.

When I am calling class Seller

Seller _seller = new Seller();

It throws error " Object reference not set to an instance of an object" when the cursor reads the above string object??

Its very irritating Error. I tried every thing but didn,t found any solution. Please help on this.

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