<add key="Excel03ConString" value="Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};Extended Properties='Excel 8.0;HDR={0};'"/>
connectionString = ConfigurationManager.AppSettings["Excel03ConString"].ToString();
String connectionString = ConfigurationManager.AppSettings["Excel03ConString"]; String fileName = ConfigurationManager.AppSettings["FileName"]; // Or take it from a database or where ever connectionString = String.Format(connectionString, fileName);
var
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