Export to Excel Issue [Resolved]

Dear All,

I want to export database table into excel , I tried below code but it is throwing an exception,

SqlConnection cnn;
string connectionString = null;
string sql = null;
string data = null;
int i = 0;
int j = 0;

Microsoft.Office.Interop.Excel.Application xlApp;
Workbook xlWorkBook;
Worksheet xlWorkSheet;
object misValue = System.Reflection.Missing.Value;

xlApp = new ApplicationClass();

xlWorkBook = xlApp.Workbooks.Add(misValue);
xlWorkSheet = (Worksheet)xlWorkBook.Worksheets.get_Item(1);

connectionString = "data source=XYZ;initial catalog=HPBTMU;user id=;password=;";
cnn = new SqlConnection(connectionString);
cnn.Open();
sql = "select * from RegisterCustomer";
SqlDataAdapter dscmd = new SqlDataAdapter(sql, cnn);
DataSet ds = new DataSet();
dscmd.Fill(ds);

for (i = 0; i <= ds.Tables[0].Rows.Count - 1; i++)
{
for (j = 0; j <= ds.Tables[0].Columns.Count - 1; j++)
{
data = ds.Tables[0].Rows[i].ItemArray[j].ToString();
xlWorkSheet.Cells[i + 1, j + 1] = data;
}
}

xlWorkBook.SaveAs("csharp.net-informations.xls", XlFileFormat.xlWorkbookNormal, misValue, misValue, misValue, misValue, XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue, misValue);
xlWorkBook.Close(true, misValue, misValue);
xlApp.Quit();

releaseObject(xlWorkSheet);
releaseObject(xlWorkBook);
releaseObject(xlApp);

MessageBox.Show("Excel file created , you can find the file c:\\csharp.net-informations.xls");

The exception it is throwing is,
System.InvalidCastException was unhandled
Message=Unable to cast COM object of type 'Microsoft.Office.Interop.Excel.ApplicationClass' to interface type 'Microsoft.Office.Interop.Excel._Application'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{000208D5-0000-0000-C000-000000000046}' failed due to the following error: Error loading type library/DLL. (Exception from HRESULT: 0x80029C4A (TYPE_E_CANTLOADLIBRARY)).
Source=Microsoft.Office.Interop.Excel

Please help me to fix this issue or let me know is there any other way to export Database table in excel in C# Windows ?

[Resolved]