Streamwriter and streamreader-reading and writing files

You can use the streamwriter class to write text files:
<Table border = "1">
<Tr>
<TD colspan = "2" style = "color: #660066;">
Writing text files:
</TD>
</Tr>
<Tr>
<TD style = "font-size: 10pt">
Enter the file name:
</TD>
<TD style = "width: 158px">
<Asp: textbox id =" Filetextbox "Runat =" server "> </ASP: textbox>
</TD>

</Tr>
<Tr>
<TD style = "width: 158px">
Enter the file content:
</TD>

<TD>
<Asp: textbox id =" Contenttextbox "Runat =" server "textmode =" multiline "Height =" 216px "width =" 216px "> </ASP: textbox>
</TD>
</Tr>
<Tr>
<TD colspan = "2">
<Asp: Label id =" Msglabel "Runat =" server "> </ASP: Label>
</TD>
</Tr>
<Tr>
<TD align = "center" colspan = "2">
<Asp: button id = "surebutton" runat = "server" text = "Confirm write" onclick =" Surebutton_click "/>
</TD>
</Tr>
</Table>
Using system. IO;

Protected voidSurebutton_click(Object sender, eventargs E)
{
Try
{
If (file. exists (filetextbox. Text ))
{
Msglabel. Text = "this file already exists! ";

Return;
}
Else
{
Streamwriter Sw = file. createtext (filetextbox. Text );
Sw. writeline (Contenttextbox. Text );
Sw. Close ();
Msglabel. Text = "Write successful! ";
}
}
Catch (exception ee)
{
Msglabel. Text = "failed to write file! Cause of failure: "+ ee. tostring ();
}
}

You can use the streamreader class to read text files:
<Table border = "1">
<Tr>
<TD colspan = "2" style = "color: #660066;">
Read text files:
</TD>
</Tr>
<Tr>
<TD style = "font-size: 10pt">
Enter the file name:
</TD>
<TD style = "width: 158px">
<Asp: textbox id =" Filetextbox "Runat =" server "> </ASP: textbox>
</TD>

</Tr>
<Tr>
<TD align = "center" colspan = "2">
<Asp: button id = "surebutton" runat = "server" text = "Confirm write" onclick =" Surebutton_click "/>
</TD>
</Tr>
<Tr>
<TD colspan = "2">
<Asp: Label id ="Msglabel "Runat =" server "> </ASP: Label>
</TD>
</Tr>
<Tr>
<TD colspan = "2">
<Asp: textbox ID = "Contenttextbox "Runat =" server "textmode =" multiline "Height =" 216px "width =" 355px "> </ASP: textbox>
</TD>
</Tr>
</Table>

Using system. IO;

Protected void surebutton_click (Object sender, eventargs E)
{
Try
{
If (! File. exists (filetextbox. Text ))
{
Msglabel. Text = "this file does not exist! ";
Contenttextbox. Visible = false;

Return;
}
Else
{
Streamreader Sr = File. opentext (Filetextbox. Text );
Contenttextbox. Text = sr. Readtoend ();
Sr. Close ();
Contenttextbox. Visible = true;
Msglabel. Text = "The text file is successfully read! The content is as follows :";
}
}
Catch (exception ee)
{
Msglabel. Text = "failed to process the read text file! Cause of failure: "+ ee. tostring ();
}
}