Format cells in Excel using C#

Hi,

I have exported data from a dataset to excel using the following code.  I 
need to change the back color of the column header, font, border style of the 
cells.  can any one help me out in doing that.  

Code:


public static void exportToExcel(DataSet source, string fileName)  
        {  
            try 
            {  
                System.IO.StreamWriter excelDoc;  
                excelDoc = new System.IO.StreamWriter(fileName);  
                const string startExcelXML = "<xml version>\r\n<Workbook " +  
                      "xmlns=\"urn:schemas-microsoft-com:office:spreadsheet\"\r\n" +  
                      " xmlns:o=\"urn:schemas-microsoft-com:office:office\"\r\n " +  
                      "xmlns:x=\"urn:schemas-    microsoft-com:office:" + 
                      "excel\"\r\n xmlns:ss=\"urn:schemas-microsoft-com:" + 
                      "office:spreadsheet\">\r\n <Styles>\r\n " +  
                      "<Style ss:ID=\"Default\" ss:Name=\"Normal\">\r\n " +  
                      "<Alignment ss:Vertical=\"Bottom\"/>\r\n <Borders/>" +  
                      "\r\n <Font/>\r\n <Interior/>\r\n <NumberFormat/>" +  
                      "\r\n <Protection/>\r\n </Style>\r\n " +  
                      "<Style ss:ID=\"BoldColumn\">\r\n <Font " +  
                      "x:Family=\"Swiss\" ss:Bold=\"1\"/>\r\n </Style>\r\n " +  
                      "<Style     ss:ID=\"StringLiteral\">\r\n <NumberFormat" +  
                      " ss:Format=\"@\"/>\r\n </Style>\r\n <Style " +  
                      "ss:ID=\"Decimal\">\r\n <NumberFormat " +  
                      "ss:Format=\"0.0000\"/>\r\n </Style>\r\n " +  
                      "<Style ss:ID=\"Integer\">\r\n <NumberFormat " +  
                      "ss:Format=\"0\"/>\r\n </Style>\r\n <Style " +  
                      "ss:ID=\"DateLiteral\">\r\n <NumberFormat " +  
                      "ss:Format=\"mm/dd/yyyy;@\"/>\r\n </Style>\r\n " +  
                      "</Styles>\r\n ";  
                const string endExcelXML = "</Workbook>";  
 
                int rowCount = 0;  
                int sheetCount = 1;  
                  
                //@&%$#@!@&%$#@!@&%$#@!@&%$#@!@&%$#@!@&%$#@!@&%$#@!@&%$#@!                  
                /* 
               <xml version> 
               <Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet" 
               xmlns:o="urn:schemas-microsoft-com:office:office" 
               xmlns:x="urn:schemas-microsoft-com:office:excel" 
               xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet"> 
               <Styles> 
               <Style ss:ID="Default" ss:Name="Normal"> 
                 <Alignment ss:Vertical="Bottom"/> 
                 <Borders/> 
                 <Font/> 
                 <Interior/> 
                 <NumberFormat/> 
                 <Protection/> 
               </Style> 
               <Style ss:ID="BoldColumn"> 
                 <Font x:Family="Swiss" ss:Bold="1"/> 
               </Style> 
               <Style ss:ID="StringLiteral"> 
                 <NumberFormat ss:Format="@"/> 
               </Style> 
               <Style ss:ID="Decimal"> 
                 <NumberFormat ss:Format="0.0000"/> 
               </Style> 
               <Style ss:ID="Integer"> 
                 <NumberFormat ss:Format="0"/> 
               </Style> 
               <Style ss:ID="DateLiteral"> 
                 <NumberFormat ss:Format="mm/dd/yyyy;@"/> 
               </Style> 
               </Styles> 
               <Worksheet ss:Name="Sheet1"> 
               </Worksheet> 
               </Workbook> 
               */ 
                //@&%$#@!@&%$#@!@&%$#@!@&%$#@!@&%$#@!@&%$#@!@&%$#@!@&%$#@!  
 
 
                excelDoc.Write(startExcelXML);  
                excelDoc.Write("<Worksheet ss:Name=\"Sheet" + sheetCount + "\">");  
                excelDoc.Write("<Table>");  
                excelDoc.Write("<Row>");  
                 
                for (int x = 0; x < source.Tables[0].Columns.Count; x++)  
                {            
                    excelDoc.Write("<Cell ss:StyleID=\"BoldColumn\"><Data ss:Type=\"String\">");  
                    excelDoc.Write(source.Tables[0].Columns[x].ColumnName);  
                    excelDoc.Write("</Data></Cell>");  
                }  
                 
                excelDoc.Write("</Row>");  
                foreach (DataRow x in source.Tables[0].Rows)  
                {  
                    rowCount++;  
                    //if the number of rows is > 64000 create a new page to continue output  
                    if (rowCount == 64000)  
                    {  
                        rowCount = 0;  
                        sheetCount++;  
                        excelDoc.Write("</Table>");  
                        excelDoc.Write(" </Worksheet>");  
                        excelDoc.Write("<Worksheet ss:Name=\"Sheet" + sheetCount + "\">");  
                        excelDoc.Write("<Table>");  
                    }  
                    excelDoc.Write("<Row>"); //ID=" + rowCount + "  
                    for (int y = 0; y < source.Tables[0].Columns.Count; y++)  
                    {  
                        System.Type rowType;  
                        rowType = x[y].GetType();  
                        switch (rowType.ToString())  
                        {  
                            case "System.String":  
                                string XMLstring = x[y].ToString();  
                                XMLstring = XMLstring.Trim();  
                                XMLstring = XMLstring.Replace("&", "&");  
                                XMLstring = XMLstring.Replace(">", ">");  
                                XMLstring = XMLstring.Replace("<", "<");  
                                excelDoc.Write("<Cell ss:StyleID=\"StringLiteral\">" +  
                                               "<Data ss:Type=\"String\">");  
                                excelDoc.Write(XMLstring);  
                                excelDoc.Write("</Data></Cell>");  
                                break;  
                            case "System.DateTime":  
                                //Excel has a specific Date Format of YYYY-MM-DD followed by    
                                //the letter 'T' then hh:mm:sss.lll Example 2005-01-31T24:01:21.000  
                                //The Following Code puts the date stored in XMLDate   
                                //to the format above  
                                DateTime XMLDate = (DateTime)x[y];  
                                string XMLDatetoString = ""; //Excel Converted Date  
                                XMLDatetoString = XMLDate.Year.ToString() +  
                                     "-" +  
                                     (XMLDate.Month < 10 ? "0" +  
                                     XMLDate.Month.ToString() : XMLDate.Month.ToString()) +  
                                     "-" +  
                                     (XMLDate.Day < 10 ? "0" +  
                                     XMLDate.Day.ToString() : XMLDate.Day.ToString()) +  
                                     "T" +  
                                     (XMLDate.Hour < 10 ? "0" +  
                                     XMLDate.Hour.ToString() : XMLDate.Hour.ToString()) +  
                                     ":" +  
                                     (XMLDate.Minute < 10 ? "0" +  
                                     XMLDate.Minute.ToString() : XMLDate.Minute.ToString()) +  
                                     ":" +  
                                     (XMLDate.Second < 10 ? "0" +  
                                     XMLDate.Second.ToString() : XMLDate.Second.ToString()) +  
                                     ".000";  
                                excelDoc.Write("<Cell ss:StyleID=\"DateLiteral\">" +  
                                             "<Data ss:Type=\"DateTime\">");  
                                excelDoc.Write(XMLDatetoString);  
                                excelDoc.Write("</Data></Cell>");  
                                break;  
                            case "System.Boolean":  
                                excelDoc.Write("<Cell ss:StyleID=\"StringLiteral\">" +  
                                            "<Data ss:Type=\"String\">");  
                                excelDoc.Write(x[y].ToString());  
                                excelDoc.Write("</Data></Cell>");  
                                break;  
                            case "System.Int16":  
                            case "System.Int32":  
                            case "System.Int64":  
                            case "System.Byte":  
                                excelDoc.Write("<Cell ss:StyleID=\"Integer\">" +  
                                        "<Data ss:Type=\"Number\">");  
                                excelDoc.Write(x[y].ToString());  
                                excelDoc.Write("</Data></Cell>");  
                                break;  
                            case "System.Decimal":  
                            case "System.Double":  
                                excelDoc.Write("<Cell ss:StyleID=\"Decimal\">" +  
                                      "<Data ss:Type=\"Number\">");  
                                excelDoc.Write(x[y].ToString());  
                                excelDoc.Write("</Data></Cell>");  
                                break;  
                            case "System.DBNull":  
                                excelDoc.Write("<Cell ss:StyleID=\"StringLiteral\">" +  
                                      "<Data ss:Type=\"String\">");  
                                excelDoc.Write("");  
                                excelDoc.Write("</Data></Cell>");  
                                break;  
                            default:  
                                throw (new Exception(rowType.ToString() + " not handled."));  
                        }  
                    }  
                    excelDoc.Write("</Row>");  
                }  
                excelDoc.Write("</Table>");  
                excelDoc.Write(" </Worksheet>");  
                excelDoc.Write(endExcelXML);                  
                excelDoc.Close();  
            }  
 
            catch (Exception EX)  
            {  
                MessageBox.Show(EX.Message);  
            }                        
        } 
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