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C#: Getting a cell's value with Excel.interop
if((string)(ws_Varsheet.get_Range("L" + iIndex, "L" + iIndex).Text) != "")
          {

            rng_ResolutionCell = ws_Varsheet.get_Range("L" + iIndex, "L" + iIndex);
            float iResolution;
            rng_ResolutionCell.Cells.get_Value(&iResolution); //what to do here?
            str_Resolution = ((string)iResolution.toString()).Replace(",",".");
            str_Resolution = str_Resolution.Replace(" ","");
             mObj.Str_Resolution="1";
          }

var cellRangeValue = rng_ResolutionCell.get_Value(System.Type.Missing);