Web Forms :: Page Not Rendering Image From Session Variable
Apr 27, 2016
below is .ashx file shows error on If context.Session("photo1") <> "" Then why? I need to display an image on button click that saved in database.
imgHandler.ashx:
Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest
If context.Session("photo1") <> "" Then
Dim bytes() As Byte = DirectCast(context.Session("photo1"), [Byte]())
context.Response.Buffer = True
[code]...
on display page on button click:
Session("photo1") = HttpUtility.HtmlEncode(ds.Tables(0).Rows(0)("applicant_photo").ToString())
Image1.ImageUrl = "../imgHandler.ashx"
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IDE: MS Visual Studio 2008 / SQL Server 2005 Express / SQL Server Management Studio Express 2005
Skills: Beginner
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Current code
SqlConnection connection = null;
connection = new SqlConnection(ConfigurationManager.ConnectionStrings["PSI_DB_1ConnectionString"].ConnectionString.ToString());
connection.Open();
int id = Convert.ToInt32(Request.QueryString["id"]);
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SQLquery = string.Concat("Select ImageData,ImageType from WebBGImages where ImageID=",id);
}
SqlCommand Cmd = new SqlCommand(SQLquery, connection);
SqlDataReader Dr = Cmd.ExecuteReader();
if (Dr.HasRows)
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while (Dr.Read())
{
Byte[] bytes = ((Byte[])Dr["ImageData"]);
Response.Buffer = true;
Response.Charset = "";
Response.ContentType = Dr["ImageType"].ToString();
Response.BinaryWrite(bytes);
Response.End();
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.BinaryWrite(bytes);
}
}
Response.Flush();
Response.End();
Cmd.Dispose();
connection.Close();
connection.Dispose();
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May 25, 2010
I have the dataset. in this i am having total 20 tables with huge amount of data..I want use this data over all the page..so where i can keep this data..
before i used viewstate but the viewstate data is render to page every postback ..so this time the page size is increasing(interanlly viewstate is rendered to page)..so performence wise it was very slow..
Now i change my logic insted of viewstate to i used Globel Dataset on Page Level.. now the performence wise better than viewstate..
i used Like shared dsControls as Dataset at top of the page..so every time i use this dataset..
my quesation is session is better or Globel variable is better way use in my situavation..
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