c# - Oledb Read False Value From Excel Sheet -


i trying read excel sheet already opened in window explorer using oledbreader following code

system.data.oledb.oledbconnection mcon; mcon.connectionstring = ("provider=microsoft.ace.oledb.12.0;data source=" + openfiledialog1.filename + ";extended properties=\"excel 12.0;hdr=no;imex=1\";"); strselectquery = "select top 20 * [$sheet1]";         if (mcon.state == connectionstate.closed)         {             mcon.open();         }         dataadapter = new system.data.oledb.oledbdataadapter(strselectquery, mcon);         dataadapter.fill(mdtable);         dataadapter.dispose();         mcon.close();

here reads 

 03-aug-12 41124 // excel column has genral format  07:29:19 0.31202546296 //excel column has genral format  359307046362750 3.5930704636e+014 // excel column has number format decimal place 0

if excel file closed reads value in correct format. why doing ?


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