Send query results to Excel from ASP.NET website

Question

We let users create ad-hoc queries in our website. We would like to have the user select their criteria, then click submit and have the results streamed automatically to Ex

Answer 1

Once you have your Dataset you can convert it to an object[,] and insert it into an Excel document. Then you can save the document to disk and stream it to the user.

        //write the column headers
        for (int cIndex = 1; cIndex < 1 + columns; cIndex++)
            sheet.Cells.set_Item(4, cIndex, data.Columns[cIndex - 1].Caption);
        if (rows > 0)
        {

            //select the range where the data will be pasted
            Range r = sheet.get_Range(sheet.Cells[5, 1], sheet.Cells[5 + (rows - 1), columns]);

            //Convert the datatable to an object array
            object[,] workingValues = new object[rows, columns];

            for (int rIndex = 0; rIndex < rows; rIndex++)
                for (int cIndex = 0; cIndex < columns; cIndex++)
                    workingValues[rIndex, cIndex] = data.Rows[rIndex][cIndex].ToString();

            r.Value2 = workingValues;
         }