Format cells 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;

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);
}
}