这是一个asp.net的全文教程.里面还有数据库的数据.对初学者有很大的帮助

				
				
				
				Ch13-02-01.aspx 检查指定的文件是否存在
				
					Sub Button1_Click(Obj As Object, E As EventArgs)
						Dim FileName As String = File1.Text
						If Trim(File1.Text) = "" then
							Label1.Text = "请输入文件名称！"
							Exit Sub
						End If
						Dim Files As New FileInfo(FileName)
						If Files.Exists Then
							Label1.Text = "文件存在！"
						Else
							Label1.Text = "文件不存在！"
						End if 
					End Sub
				 
				
				
				
					文件名称：
									   		Runat="Server" />
									   		OnClick="Button1_Click" Runat="Server" />
									   		BorderColor="#FF0000" Runat="Server" />