Creating Log File

actually keep this piece of code in a class called util. so I'm just going to paste the function and also the setting in the config file.

Setting in Config File

<add key="FilePath" value="D:\logFile.txt"/>

public static void function in util.cs

public static void writeToLogFile(string logMessage)
{
string strLogMessage = string.Empty;
string strLogFile = System.Configuration.ConfigurationManager.AppSettings["logFilePath"].ToString();
StreamWriter swLog;

strLogMessage = string.Format("{0}: {1}", DateTime.Now, logMessage);

if (!File.Exists(strLogFile))
{
swLog = new StreamWriter(strLogFile);
}
else
{
swLog = File.AppendText(strLogFile);
}

swLog.WriteLine(strLogMessage);
swLog.WriteLine();

swLog.Close();

}

Create Excel File

public static bool CreateExcelFile(DataTable dataTable, string fileName)
{
try
{
string str = "";
string str2 = "";
string str3 = "";
string str4 = string.Empty;
StringBuilder builder = new StringBuilder();
foreach (DataColumn column in dataTable.Columns)
{
str3 = str3 + "" + column.ColumnName + "";
}
str3 = str3 + "";
foreach (DataRow row in dataTable.Rows)
{
builder.Append("");
for (int i = 0; i < dataTable.Columns.Count; i++)
{
str4 = " ";
if (!string.IsNullOrEmpty(row[i].ToString()))
{
str4 = row[i].ToString();
}
builder.Append("" + str4 + "");
}
builder.Append("");
}
string s = str + str3 + builder.ToString() + str2;
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.AddHeader("content-disposition", "attachment;filename=" + fileName);
HttpContext.Current.Response.Charset = "";
HttpContext.Current.Response.ContentType = "application/vnd.xls";
HttpContext.Current.Response.Write(s);
HttpContext.Current.Response.Flush();
return true;
}
catch
{
return false;
}
}