Why is it throwing error on Download file using link button in ASP.Net ?

Question

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I have a link button in Gridview and clicking on it should open the file that is associated with it. The error I am getting is

JavaScript runtime error: Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed.

VB

Protected Sub btnDownload_Click(ByVal sender As Object, ByVal e As System.EventArgs)
      Try
          '  Dim grdrow as GridViewRow =DirectCast((LinkButton),sender.NamingContainer, GridViewRow)
          Dim filePath As String = CType(sender, LinkButton).CommandArgument
          If Not filePath = "" Then
              Response.ContentType = ContentType
              Response.AppendHeader("Content-Disposition", ("attachment; filename=" + Path.GetFileName(filePath)))
              Response.WriteFile(filePath)
              Response.OutputStream.Close()
              ' HttpContext.Current.Response.End()
          Else
              ScriptManager.RegisterStartupScript(Me, Me.GetType(), "script", "alert('No file attached');", True)
          End If
      Catch ex As Exception
          ScriptManager.RegisterStartupScript(Me, Me.GetType(), "script", "Error Downloading the File", True)
          LogError.LogErrorIntoTextFile(ex, "btnDownload_Click()")
      End Try
  End Sub

can anyone help me in solving this error?

Posted 24-Feb-15 9:15am

sudevsu

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Comments

ZurdoDev 24-Feb-15 16:07pm

What is the error on the server side?

sudevsu 24-Feb-15 16:42pm

I am not sure. It only shows
JavaScript runtime error: Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed.

ZurdoDev 24-Feb-15 16:44pm

Put a breakpoint in the VB code and see what the exception is.

sudevsu 24-Feb-15 16:47pm

Alright I did that until the control finish executing btnDownload_Click function, there is no error. Only after that it take me to Script resource file and throws javascript error

sudevsu 24-Feb-15 16:43pm

There is nothing to parse. I guess its because of Respose.WriteFile and OutputStream.

1 solution

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santosh_131 · Answer 1 · 2015-02-24T10:31:00

Solution 1

Try adding the scriptmanager (say---> sm1)to the page or masterpage(markup),
now declare a variable(sm) in the webpage codebehind where the grid view is present( ScriptManager sm;)

Now in the row databound event of the gridview do the following

C#

if (e.Row.RowType == DataControlRowType.DataRow)
{
sm = ScriptManager.GetCurrent(this.Page);
sm.RegisterPostBackControl(e.Row.FindControl("btnDownload"));
}

Note: I did it in C# you can try this vb and let me know if this works

Posted 24-Feb-15 10:31am

santosh_131

Updated 24-Feb-15 16:56pm

v4

Comments

sudevsu 24-Feb-15 16:36pm

Thank you. I can do in VB. But why you need this? I already have Script manager in ASPX bcoz my grid is in Update panel. I am not sure why we need to this. Instead we can add post back Trigger in ASPX page right! Correct me if I am wrong.

santosh_131 25-Feb-15 10:17am

btnDownload is inside the gridview so you have to register it in the row databound event