I'm trying to download a file from an SQL Server table. I am using a GridView. Whenever I try to download a file, I get a corrupted file.
I am using ASP.NET and VB.NET with SQL Server 2012 Express.
Any ideas why ?
Protected Sub GridView1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles GridView1.SelectedIndexChanged
Dim ContentID = Convert.ToInt32(GridView1.SelectedRow.Cells(1).Text)
Dim ContentName = GridView1.SelectedRow.Cells(2).Text
Dim ContentType = GridView1.SelectedRow.Cells(3).Text
lblContentName.Text = "[ " + ContentName + " ]"
lblContentName.Visible = True
End Sub
Protected Sub GridView1_RowCommand(sender As Object, e As GridViewCommandEventArgs)
Dim cn As New SqlConnection("Data Source=BRIAN-PC\SQLEXPRESS;Initial Catalog=master_db;Integrated Security=True;")
If e.CommandName = "Download" Then
Dim filename As String = String.Empty
Dim id As Integer = Convert.ToInt32(e.CommandArgument)
Dim cmd As New SqlCommand("SELECT content_name,content_type,content_data FROM content WHERE content_id = " & id, cn)
cn.Open()
Dim dr As SqlDataReader = cmd.ExecuteReader
Dim bytes As Byte()
dr = cmd.ExecuteReader()
If dr.Read() Then
filename = dr("content_name").ToString()
Response.ContentType = dr("content_type").ToString()
Response.AddHeader("Content-Disposition", "attachment;filename=" & filename)
bytes = DirectCast(dr("content_file"), Byte())
Response.Cache.SetCacheability(HttpCacheability.NoCache)
Response.BinaryWrite(bytes)
Response.Flush()
Response.[End]()
End If
End If
End Sub
Private Sub BindGrid()
Dim constr As String = ConfigurationManager.ConnectionStrings("ConnStringDb1").ConnectionString
Using con As New SqlConnection(constr)
Using cmd As New SqlCommand()
cmd.CommandText = "SELECT content_id, content_name FROM content"
cmd.Connection = con
con.Open()
GridView1.DataSource = cmd.ExecuteReader()
GridView1.DataBind()
con.Close()
End Using
End Using
End Sub
Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
If Not IsPostBack Then
BindGrid()
End If
End Sub