Export multiple DataSets to multiple Excel sheets dynamically formatted according to the record's data type

“Export multiple DataSets to multiple Excel sheets dynamically formatted according to the record's data type”

public void DataSetsToExcel(List<DataSet> dataSets, string fileName)

    {

        Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();

        Microsoft.Office.Interop.Excel.Workbook xlWorkbook = xlApp.Workbooks.Add(XlWBATemplate.xlWBATWorksheet);

        Sheets xlSheets = null;

        Microsoft.Office.Interop.Excel.Worksheet xlWorksheet = null;

        foreach (DataSet dataSet in dataSets)

        {

            System.Data.DataTable dataTable = dataSet.Tables[0];

            int rowNo = dataTable.Rows.Count;

            int columnNo = dataTable.Columns.Count;

            int colIndex = 0;

            //Create Excel Sheets

            xlSheets = xlWorkbook.Sheets;

            xlWorksheet = (Microsoft.Office.Interop.Excel.Worksheet)xlSheets.Add(xlSheets[1],

                           Type.Missing, Type.Missing, Type.Missing);

            xlWorksheet.Name = dataSet.DataSetName;

            //Generate Field Names

            foreach (DataColumn dataColumn in dataTable.Columns)

            {

                colIndex++;

                xlApp.Cells[1, colIndex] = dataColumn.ColumnName;

            }

            object[,] objData = new object[rowNo, columnNo];

            //Convert DataSet to Cell Data

            for (int row = 0; row < rowNo; row++)

            {

                for (int col = 0; col < columnNo; col++)

                {

                    objData[row, col] = dataTable.Rows[row][col];

                }

            }

            //Add the Data

            Range range = xlWorksheet.Range[xlApp.Cells[2, 1], xlApp.Cells[rowNo + 1, columnNo]];

            range.Value2 = objData;

            //Format Data Type of Columns

            colIndex = 0;

            foreach (DataColumn dataColumn in dataTable.Columns)

            {

                colIndex++;

                string format = "@";

                switch (dataColumn.DataType.Name)

                {

                    case "Boolean":

                        break;

                    case "Byte":

                        break;

                    case "Char":

                        break;

                    case "DateTime":

                        format = "dd/mm/yyyy";

                        break;

                    case "Decimal":

                        format = "$* #,##0.00;[Red]-$* #,##0.00";

                        break;

                    case "Double":

                        break;

                    case "Int16":

                        format = "0";

                        break;

                    case "Int32":

                        format = "0";

                        break;

                    case "Int64":

                        format = "0";

                        break;

                    case "SByte":

                        break;

                    case "Single":

                        break;

                    case "TimeSpan":

                        break;

                    case "UInt16":

                        break;

                    case "UInt32":

                        break;

                    case "UInt64":

                        break;

                    default: //String

                        break;

                }

                //Format the Column accodring to Data Type

                xlWorksheet.Range[xlApp.Cells[2, colIndex],

                      xlApp.Cells[rowNo + 1, colIndex]].NumberFormat = format;

            }

        }

        //Remove the Default Worksheet

        ((Microsoft.Office.Interop.Excel.Worksheet)xlApp.ActiveWorkbook.Sheets[xlApp.ActiveWorkbook.Sheets.Count]).Delete();

        //Save

        xlWorkbook.SaveAs(fileName, System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value, XlSaveAsAccessMode.xlNoChange, System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value);

        xlWorkbook.Close();

        xlApp.Quit();

        GC.Collect();

    }

DataSet dataSet1 = new DataSet("My Data Set 1");

dataAdapter1.Fill(dataSet1);

DataSet dataSet2 = new DataSet("My Data Set 2");

dataAdapter1.Fill(dataSet2);

DataSet dataSet3 = new DataSet("My Data Set 3");

dataAdapter1.Fill(dataSet3);

List<DataSet> dataSets = new List<DataSet>();

dataSets.Add(dataSet1);

dataSets.Add(dataSet2);

dataSets.Add(dataSet3);

DataSetsToExcel(dataSets, "{Your File Name}")