private CellValues getExcelType(string systemType)
{
if (systemType == "Int16" || systemType == "Int32" || systemType == "Int64" || systemType == "UInt16" || systemType == "UInt32" || systemType == "UInt64" || systemType == "Double" || systemType == "Decimal")
return CellValues.Number;
if (systemType == "Char" || systemType == "String")
return CellValues.SharedString;
if (systemType == "DateTime")
return CellValues.Date;
if (systemType == "Boolean")
return CellValues.Boolean;
return CellValues.SharedString;
}