Issues in exporting excel sheet in Windows server datacenter 2008 R2

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C#

Office

MS-Excel

Hi,

I am exporting an excel sheet using C# code which is perfectly working locally. But when i deployed into the server it returning me the error said "retrieving the com class factory for component with CLSID {00024500-0000-0000-C000-000000000046} failed due to following error:80040154". I am using asp.net 4.5 and included the reference of Microsoft.Office.Interop version 14.0.0, I googled the error and found there must be Office com in my server machine so i installed office 2003 but no luck still giving the same error.
Can anyone let me know what software should i install in server machine.?
Please help me its very urgent.
Below the code:

public string ExportExcelFormat()
{
string retError = "";
try
{
System.Data.DataTable dtExcel = new DataTable();

dtExcel.Columns.Add("Name", typeof(string));
dtExcel.Columns.Add("Dept", typeof(string));
dtExcel.Columns.Add("Req", typeof(string));


retError= CreateWorkbook(dtExcel, "");
}
catch { }
return retError;
}

public string CreateWorkbook(System.Data.DataTable dtExcelData, String path1)
{
string retError = "";
int rowindex = 0;
int columnindex = 1;
try
{
object oMissing = System.Reflection.Missing.Value;
Microsoft.Office.Interop.Excel.Application app;
Microsoft.Office.Interop.Excel.Worksheet wksheet;
Microsoft.Office.Interop.Excel.Workbook wkbook;
app = new Microsoft.Office.Interop.Excel.Application();
app.Visible = false;
wkbook = app.Workbooks.Add(true);
wksheet = (Microsoft.Office.Interop.Excel.Worksheet)wkbook.ActiveSheet;
string[] ddl_itemReq = { "R", "S" };
string[] ddl_item = { "Answers", "Autos", "Finance" };
Microsoft.Office.Interop.Excel.Range xlsRange;
int lastRow = wksheet.Cells.SpecialCells(Microsoft.Office.Interop.Excel.XlCellType.xlCellTypeLastCell, Type.Missing).Row;
Microsoft.Office.Interop.Excel.Range last = wksheet.Cells.SpecialCells(Microsoft.Office.Interop.Excel.XlCellType.xlCellTypeLastCell, Type.Missing);
xlsRange = wksheet.get_Range("A2", "A2");

try
{
for (int i = 0; i < dtExcelData.Columns.Count; i++)
{
wksheet.Cells[1, i + 1] = dtExcelData.Columns[i].ColumnName;
}

foreach (DataRow row in dtExcelData.Rows)
{
rowindex++;
columnindex = 0;
foreach (DataColumn col in dtExcelData.Columns)
{
columnindex++;
wksheet.Cells[rowindex + 1, columnindex] = row[col.ColumnName];
}
}
Microsoft.Office.Interop.Excel.DropDowns xlDropDowns;
Microsoft.Office.Interop.Excel.DropDown xlDropDown;
xlDropDowns = ((Microsoft.Office.Interop.Excel.DropDowns)(wksheet.DropDowns(oMissing)));
xlDropDown = xlDropDowns.Add((double)xlsRange.Left, (double)xlsRange.Top, (double)xlsRange.Width, (double)xlsRange.Height, true);

for (int i = 2; i < 4; i++)
{
Microsoft.Office.Interop.Excel.DropDown xlDrop1;
xlsRange = wksheet.get_Range("B"+i, "B"+i);
xlDropDown = xlDropDowns.Add((double)xlsRange.Left, (double)xlsRange.Top, (double)xlsRange.Width, (double)xlsRange.Height, true);

for (int j = 0; j < ddl_item.Count(); j++)
{
var getIng = ddl_item[j];
xlDropDown.AddItem(getIng, j + 1);
}

xlsRange = wksheet.get_Range("C" + i, "C" + i);
xlDropDown = xlDropDowns.Add((double)xlsRange.Left, (double)xlsRange.Top, (double)xlsRange.Width, (double)xlsRange.Height, true);

for (int j = 0; j < ddl_itemReq.Count(); j++)
{
xlDropDown.AddItem(ddl_itemReq[j], j + 1);
}
}
app.Visible = true;
}
catch (Exception ex1)
{
retError = ex1.Message;
}
app.UserControl = true;
}
catch (Exception ex1) { retError = ex1.Message; }
return retError;
}

Need an urgent help.

Thank you.