generating excel report in web application from sql data

excel=Microsoft.Office.Interop.Excel;

Application xlapp;

Workbook xlwb;

Worksheet xlws;

object misvalue = System.Reflection.Missing.Value;

new excel.ApplicationClass();

Worksheet)xlwb.Worksheets.get_Item(1);

////////////////////////////////////////////

/////////to save column names///////////////

//////////////////////////////////////////////

//for (int i = 0; i < dataGridView1.Columns.Count; i++)

//{

//    int x = i;

//    x = x + 1;

//    xlws.Cells[1, x] = (string)dataGridView1.Columns[i].Name;

//}

///////////////////////////////////////////////

//////////to save data from datagridview///////

///////////////////////////////////////////////

int q = 0;

for (int a = 2; a <= 2; a++)//take dataset table of row count to check loop condition

for (int b = 1; b <= dataGridView1.Columns.Count; b++)

//only columns are saves not rows

/////////////////////////////////////////////////////////////////////

////convert any type of data to string type and save in excel file///

/////////////////////////////////////////////////////////////////////

/////////////////////////////////////////////////////////////////

//take another value to increase row count then save rows data///

/////////////////////////////////////////////////////////////////

//xlws.Cells[1, 2] = h2;

//xlws.Cells[1, 3] = h3;

//xlws.Cells[2, 1] = s;

//xlws.Cells[2, 2] = s1;

//xlws.Cells[2, 3] = s2;

//  xlwb.SaveAs("C:\\Users\\"+xxx +"\\Desktop\\excel\\arjun.xls", excel.XlFileFormat.xlWorkbookNormal, misvalue, misvalue, misvalue, misvalue, excel.XlSaveAsAccessMode.xlExclusive, misvalue, misvalue, misvalue, misvalue, misvalue);

"" + saveFileDialog1.FileName + ".xls", excel.XlFileFormat.xlWorkbookNormal, misvalue, misvalue, misvalue, misvalue, excel.XlSaveAsAccessMode.xlExclusive, misvalue, misvalue, misvalue, misvalue, misvalue);

true, misvalue, misvalue);

MessageBox.Show("created");