How to Export Multiple Datasets to Single ExcelSheet? - asp.net

Question

I am having two datasets in which first dataset has 6 rows and second dataset has 'N' Number of rows , second dataset row count keeps on changing , What I need is I need to export both the dataset to a single excelsheet . Both dataset has headers , So i need to export both dataset with header to a single excelsheet using c#. Can anyone help me with a sample code in c#

Answer 1

before u have to create
1. using Excel = Microsoft.Office.Interop.Excel;//in header,and Add correct refference
2. Excel.Application excelHandle1 = PrepareForExport(Ds); //add handle in calling function excelHandle1.Visible = true;
public Excel.Application PrepareForExport(System.Data.DataSet ds,string[] sheet)
{
object missing = System.Reflection.Missing.Value;
Excel.Application excel = new Excel.Application();
Excel.Workbook workbook = excel.Workbooks.Add(missing);
DataTable dt1 = new DataTable();
dt1 = ds.Tables[0];
DataTable dt2 = new DataTable();
dt2 = ds.Tables[1];
Excel.Worksheet newWorksheet;
newWorksheet = (Excel.Worksheet)excel.Worksheets.Add(missing, missing, missing, missing);
newWorksheet.Name ="Name of data sheet";
// for first datatable dt1..
int iCol1 = 0;
foreach (DataColumn c in dt1.Columns)
{
iCol1++;
excel.Cells[1, iCol1] = c.ColumnName;
}
int iRow1 = 0;
foreach (DataRow r in dt1.Rows)
{
iRow1++;
for (int i = 1; i < dt1.Columns.Count + 1; i++)
{
if (iRow1 == 1)
{
// Add the header the first time through
excel.Cells[iRow1, i] = dt1.Columns[i - 1].ColumnName;
}
excel.Cells[iRow1 + 1, i] = r[i - 1].ToString();
}
}
// for second datatable dt2..
int iCol2 = 0;
foreach (DataColumn c in dt2.Columns)
{
iCol2++;
excel.Cells[1, iCol] = c.ColumnName;
}
int iRow2 = 0;
foreach (DataRow r in dt2.Rows)
{
iRow2++;
for (int i = 1; i < dt2.Columns.Count + 1; i++)
{
if (iRow2 == 1)
{
// Add the header the first time through
excel.Cells[iRow2, i] = dt2.Columns[i - 1].ColumnName;
}
excel.Cells[iRow2 + 1, i] = r[i - 1].ToString();
}
}
return excel;
}

Answer 2

First you have to declare namespace:
using Excel = Microsoft.Office.Interop.Excel;
public static void Main(string[] args) {
DataTable dt1 = new DataTable("Employee");
dt1.Columns.Add("Employee ID");
dt1.Columns.Add("Employee Name");
dt1.Rows.Add("1", "ABC");
dt1.Rows.Add("2", "DEF");
dt1.Rows.Add("3", "PQR");
dt1.Rows.Add("4", "XYZ");
DataTable dt3 = new DataTable("Department");
dt3.Columns.Add("Department ID");
dt3.Columns.Add("Department Name");
dt3.Rows.Add("1", "IT");
dt3.Rows.Add("2", "HR");
dt3.Rows.Add("3", "Finance");
DataSet ds = new DataSet();
ds.Tables.Add(dt1);
ds.Tables.Add(dt3);
Excel._Application app = new Microsoft.Office.Interop.Excel.Application();
Excel._Workbook workbook = app.Workbooks.Add(Type.Missing);
Excel._Worksheet worksheet = null;
app.Visible = false;
worksheet = workbook.Sheets["Sheet1"];
worksheet = workbook.ActiveSheet;
worksheet.Name = "Exported from gridview";
int z = 1;
for (int x = 0; x < ds.Tables.Count; x++)
{
int r = z;
int t = r + 1;
for (int i = 1; i < ds.Tables[x].Columns.Count + 1; i++)
{
worksheet.Cells[r, i] = ds.Tables[x].Columns[i - 1].Caption;
}
for (int i = 0; i < ds.Tables[x].Rows.Count; i++)
{
for (int j = 0; j < ds.Tables[x].Columns.Count; j++)
{
worksheet.Cells[i + t, j + 1] = ds.Tables[x].Rows[i]
[j].ToString();
}
}
z = ds.Tables[x].Rows.Count + 3;
}
string textPath = "e:\\output.xls";
if (File.Exists(textPath))
{
File.Delete(textPath);
}
workbook.SaveAs(textPath, Type.Missing, Type.Missing, Type.Missing,
Type.Missing,
Type.Missing,
Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlExclusive,
Type.Missing, Type.Missing, Type.Missing, Type.Missing);
app.Quit();
}