I got this error An unhandled exception of type 'Microsoft.SqlServer.Management.Smo.SmoException' occurred in Microsoft.SqlServer.SmoExtended.dll

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C#3.5

Hi
I got this error An unhandled exception of type 'Microsoft.SqlServer.Management.Smo.SmoException' occurred in Microsoft.SqlServer.SmoExtended.dll
while running the windows application(.exe).

I have written code for a button

string sqlConnectionString = cn.ConnectionString.ToString();
           SqlConnection conn = new SqlConnection(sqlConnectionString);
           StringBuilder sb = new StringBuilder();
           string script = string.Empty;
           Server server = new Server(new ServerConnection(conn));

while running this code i got error this .
I have taken server connection.
would u pls resolve this error