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POdisplaying image (from database) in an image control
 

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  1. POdisplaying image (from database) in an image control
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    <p>Triyng to retrieve and display image from database in an image control based on employeeid... I have taken an httphandler in which i have this:</p> <pre class="lang-vb prettyprint-override"><code> Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest 'context.Response.ContentType = "text/plain" 'context.Response.Write("Hello World!") Dim employeeId As Integer If (Not (context.Request.QueryString("employeeId")) Is Nothing) Then employeeId = Convert.ToInt32(context.Request.QueryString("employeeId")) Else Throw New ArgumentException("No parameter specified") End If Dim imageData() As Byte = {} ' get the image data from the database using the employeeId Querystring context.Response.ContentType = "image/jpeg" ' You can retrieve this also from the database context.Response.BinaryWrite(imageData) End Sub Protected Sub DisplayButton_Click(ByVal sender As Object, ByVal e As EventArgs) Handles DisplayButton.Click bind() GridView1.Visible = "True" ProcessRequest(Context) End Sub </code></pre> <p>Error: <code>The 'MasterPageFile' property can only be set in or before the 'Page_PreInit' event.</code> Where am I going wrong? What all changes do i need to make?</p> <p>This is the image control on the form:</p> <pre><code>&lt;asp:Image ID="Image1" runat="server" imageUrl="HttpHandler.ashx?employeeId=5"/&gt; </code></pre> <p>@Stefano Altieri:</p> <p>This is on Employee.aspx</p> <pre><code>Protected Sub DisplayButton_Click(ByVal sender As Object, ByVal e As EventArgs) Handles DisplayButton.Click bind() GridView1.Visible = "True" Image1.ImageUrl = "~/HttpHandler.ashx?EmployeeID='" &amp; EmailIDTextBox.Text &amp; "'" End Sub </code></pre> <p>and this is on HttpHandler.ashx</p> <pre><code>Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest 'context.Response.ContentType = "text/plain" 'context.Response.Write("Hello World!") Dim employeeId As Integer If (Not (context.Request.QueryString("employeeId")) Is Nothing) Then employeeId = Convert.ToInt32(context.Request.QueryString("employeeId")) Else Throw New ArgumentException("No parameter specified") End If Dim imageData() As Byte = {} ' get the image data from the database using the employeeId Querystring context.Response.ContentType = "image/jpeg" ' You can retrieve this also from the database context.Response.BinaryWrite(imageData) End Sub </code></pre>
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    1. CODo you know the line where the exception is thrown?
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      1. USStefano Altieri
    2. COwhen i call ProcessRequest (i.e. when it should go to the httphandler (.ashx page))
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    3. COAlso... I am a little confused... is this a page or an http handlers? It can't be both.. you have to implement http handlers in a separate ashx file
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      1. USStefano Altieri
 

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