Category
Here is an article from ftp online: Remove a Key From an INI File that describes how this can be done using the native WritePrivateProfileString and GetPrivateProfileString methods.
PermalinkYou can use regular expressions to parse delimited text, for example, very easily. Here is an article from ftp online: Parse Text Files With Regular Expressions that discusses this in more detail.
PermalinkThe MemoryStream class creates streams that use memory as storage instead of a disk or a network connection. MemoryStream encapsulates data stored as an unsigned byte array that is initialized upon creation of a MemoryStream object, or the array can be created as empty. The encapsulated data is directly accessible in memory. Memory streams can reduce the need for temporary buffers and files in an application.
For more details refer
PermalinkVB.NET
Dim path As String = Server.MapPath('webform1.aspx')
’ Put user code to initialize the page here
If(File.GetAttributes(path) And FileAttributes.Directory) = FileAttributes.Directory Then
Response.Write('Its a directory')
Else
Response.Write('Its a file')
End If
C#
string path =Server.MapPath ('webform1.aspx');
if ((File.GetAttributes(path) & FileAttributes.Directory) ==FileAttributes.Directory)
{
Response.Write ('Its a directory');
}
else
{
Response.Write ('Its a file');
}
PermalinkUse the namepsace System.IO
VB.NET
Dim fPath As String = Server.MapPath('orders.xml')
Dim fInfo As New FileInfo(fPath)
Dim strFileInfo As String
If fInfo.Exists Then
strFileInfo = 'Name: ' + fInfo.Name + '<br />'
strFileInfo += 'Location: ' + fInfo.FullName + '<br />'
strFileInfo += 'Created on: ' + fInfo.CreationTime + '<br />'
strFileInfo += 'Extension: ' + fInfo.Extension
Else
strFileInfo = 'The file <b>' + fPath + '</b> was not found.'
End If
Response.Write(strFileInfo)
C#
string fPath = Server.MapPath('orders.xml');
FileInfo fInfo = new FileInfo(fPath);
string strFileInfo ;
if(fInfo.Exists)
{
strFileInfo = 'Name: ' + fInfo.Name + '<br />';
strFileInfo += 'Location: ' + fInfo.FullName + '<br />';
strFileInfo += 'Created on: ' + fInfo.CreationTime + '<br />';
strFileInfo += 'Extension: ' + fInfo.Extension;
}
else
{
strFileInfo = 'The file <b>' + fPath + '</b> was not found.';
}
Response.Write (strFileInfo);
PermalinkTry to use ‘System.IO.File.Exists(‘path’)’. path is the physical file path and it will return you a boolean value.
PermalinkUse System.IO namespace
VB.NET
Dim path As String = ''
try
’ Determine whether the directory exists.
If Directory.Exists(path) Then
Response.Write('That path exists already.')
Return
End If
’ Try to create the directory.
Dim di As DirectoryInfo = Directory.CreateDirectory(path)
Response.Write(('Directory create successfully at ' + Directory.GetCreationTime(path)))
catch ex as Exception
Response.Write (ex.Message )
end try
C#
string path = @'c:\MyDir';
try
{
// Determine whether the directory exists.
if (Directory.Exists(path))
{
Response.Write ('That path exists already.');
return;
}
// Try to create the directory.
DirectoryInfo di = Directory.CreateDirectory(path);
Response.Write('Directory create successfully at ' + Directory.GetCreationTime(path));
}
catch(Exception ex)
{
Response.Write (ex.Message );
}
PermalinkUse namespace System.IO
VB.NET
File.Move('C:\Dir1\SomeFile.txt', 'C:\Dir1\RenamedFileName.txt')
C#
File.Move(@'C:\Dir1\SomeFile.txt', @'C:\Dir1\RenamedFileName.txt')
Refer
Note: In a Web application, the code is running in the context of the machine\ASPNET account, which has limited privileges. If the error you are getting pertains to permissions, you might need to grant to the machine\ASPNET account the rights to create and delete files in the directory where you’re working. Note that this could be a security issue.
PermalinkUse namespace
VB.NET
Protected Function GetCode(filename As String) As String
Dim sr As New StreamReader(filename)
Dim sb As New StringBuilder()
sb.Append('<code><pre>')
sb.Append(sr.ReadToEnd())
sb.Append('</pre></code>')
sr.Close()
Return sb.ToString()
sb = Nothing
sr = Nothing
End Function ’GetCode
Private Sub Button1_Click(sender As Object, e As System.EventArgs)
Response.Write(GetCode((Server.MapPath('WebForm1.aspx') + '.vb')))
End Sub ’Button1_Click
C#
protected string GetCode(string filename)
{
StreamReader sr =new StreamReader(filename );
StringBuilder sb =new StringBuilder();
sb.Append('<code><pre>');
sb.Append(sr.ReadToEnd());
sb.Append('</pre></code>');
sr.Close();
return sb.ToString();
sb = null;
sr = null;
}
private void Button1_Click(object sender, System.EventArgs e)
{
Response.Write (GetCode(Server.MapPath ('WebForm1.aspx') + '.cs'));
}
PermalinkUse namespace System.IO
VB.NET
Dim sr As StreamReader
sr = File.OpenText(Server.MapPath('1.txt'))
Dim strContents As String = sr.ReadToEnd()
’To display normal raw contents
Response.Write(strContents)
’To handle Carriage returns
Response.Write(strContents.Replace(vbCrLf, '<br>'))
sr.Close()
C#
StreamReader sr = File.OpenText(Server.MapPath('1.txt'));
string strContents = sr.ReadToEnd();
//To display normal raw contents
Response.Write(strContents);
//To handle Carriage returns
Response.Write(strContents.Replace('\n' , '<br>'));
sr.Close();
PermalinkUse namespace System.IO
VB.NET
Dim file As String = Server.MapPath('temp.html')
Dim sr As StreamReader
Dim fi As New FileInfo(file)
Dim input As String = '<pre>'
If File.Exists(file) Then
sr = File.OpenText(file)
input += Server.HtmlEncode(sr.ReadToEnd())
sr.Close()
End If
input += '</pre>'
Me.Label1.Text = input
C#
string file = Server.MapPath ('temp.html');
StreamReader sr;
FileInfo fi = new FileInfo(file);
string input = '<pre>';
if(File.Exists(file))
{
sr = File.OpenText(file);
input += Server.HtmlEncode(sr.ReadToEnd());
sr.Close();
}
input += '</pre>';
this.Label1.Text = input;
Permalink
<asp:Button id='Button1' runat='server' Text='Button'></asp:Button>
VB.NET
Dim cn As SqlConnection
Dim cmd As SqlCommand
Dim filename As String
Dim dr As SqlDataReader
Dim i As Integer
Dim sb As System.Text.StringBuilder
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
cn = New SqlConnection('server=localhost;uid=sa;pwd=;database=northwind')
filename = 'products.csv'
cmd = New SqlCommand('select * from products ', cn)
cmd.Connection.Open()
dr = cmd.ExecuteReader(CommandBehavior.CloseConnection)
sb = New System.Text.StringBuilder
’For field Names
For i = 0 To dr.FieldCount - 1
If i < (dr.FieldCount - 1) Then
sb.Append(Chr(34) & dr.GetName(i) & _
Chr(34) & ',')
Else
sb.Append(Chr(34) & dr.GetName(i) & _
Chr(34) & vbCrLf)
End If
Next
’For field Values
While dr.Read()
For i = 0 To dr.FieldCount - 1
If i < (dr.FieldCount - 1) Then
sb.Append(Chr(34) & _
dr.GetValue(i).ToString & Chr(34) & ',')
Else
sb.Append(Chr(34) & _
dr.GetValue(i).ToString & Chr(34) & vbCrLf)
End If
Next
End While
dr.Close()
cn.Close()
Response.ContentType = 'Application/x-msexcel'
Response.AddHeader _
('content-disposition', 'attachment; filename=''' & _
filename & '''')
’Write the file directly to the HTTP output stream.
Response.Write(sb.ToString)
Response.End()
End Sub
C#
SqlConnection cn ;
SqlCommand cmd ;
string filename ;
SqlDataReader dr ;
System.Text.StringBuilder sb ;
private void Button1_Click(object sender, System.EventArgs e)
{
cn = new SqlConnection('server=localhost;uid=sa;pwd=;database=northwind');
filename = 'products.csv';
cmd = new SqlCommand('select * from products ', cn);
cmd.Connection.Open();
dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
sb = new System.Text.StringBuilder();
//For field Names
for(int i = 0 ;i<= dr.FieldCount - 1;i++)
{
if( i < (dr.FieldCount - 1) )
{
sb.Append('\t' + dr.GetName(i) + '\t' + ',');
}
else
{
sb.Append('\t' + dr.GetName(i) + '\t' + '\n');
}
}
//For field Values
while( dr.Read())
{
for(int i = 0 ;i<= dr.FieldCount - 1;i++)
{
if( i < (dr.FieldCount - 1) )
{
sb.Append('\t' + dr.GetValue(i) + '\t' + ',');
}
else
{
sb.Append('\t' + dr.GetValue(i) + '\t' + '\n');
}
}
}
dr.Close();
cn.Close();
Response.ContentType = 'Application/x-msexcel';
Response.AddHeader ('content-disposition', 'attachment; filename=' + filename ) ;
//Write the file directly to the HTTP output stream.
Response.Write(sb.ToString());
Response.End();
}
PermalinkVB.NET
Response.Write (Path.GetFileName(Request.PhysicalPath))
C#
Response.Write (Path.GetFileName(Request.PhysicalPath));
PermalinkUse Request.Path
PermalinkThe browser will not allow you to save a file directly to a client machine. You could however do a Response.Redirect(‘http://server/filename’); which would send the file back to the browser, at which point the user would be prompted to save / open the file.
PermalinkUse System.IO namespace
VB.NET
Dim filePath As String = Path.GetTempPath()
Dim fileName As String = Path.GetTempFileName()
Response.Write((filePath + '
'))
Response.Write(fileName)
C#
string filePath =Path.GetTempPath ();
string fileName = Path.GetTempFileName();
Response.Write (filePath + '
' );
Response.Write (fileName );
PermalinkUse namespace System.IO
VB.NET
Dim fs As New System.IO.FileStream(Server.MapPath('1.txt'), IO.FileMode.Open)
Dim buffer(5) As Byte ’ 5=> number of characters to be read
fs.Read(buffer, 0, 5)
fs.Close()
Dim filechars() As Char = System.Text.Encoding.ASCII.GetChars(buffer)
Dim filestring As String = New String(filechars)
Response.Write(filestring)
C#
FileStream fs =new FileStream(Server.MapPath('1.txt'), FileMode.Open);
Byte[] buffer= new byte [5] ; //5 => Number of characters to be read
fs.Read(buffer, 0, 5);
fs.Close();
Char[] filechars = System.Text.Encoding.ASCII.GetChars(buffer);
string filestring = new String(filechars);
Response.Write(filestring);
PermalinkUse namespace System.IO
VB.NET
dim path as string = Server.MapPath('page1.aspx')
Response.Write ( File.GetLastWriteTime(path))
C#
string path =Server.MapPath('page1.aspx');
Response.Write ( File.GetLastWriteTime(path));
PermalinkVB.NET
System.IO.File.Delete(Server.MapPath('wnew.txt'))
C#
System.IO.File.Delete(Server.MapPath('wnew.txt'))
Make sure that you have permissions to delete a file.
Permalink