How to create a CustomValidator for testing for certain file types such as GIF or JPG Images
Shows how to create a custom validator that checks that an uploaded file is either a Jpeg or Gif with client-side and server-side validation.
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Object Reference not Set to an Instance of an Object
The most common error in .NET applications can occur in a variety of scenarios.
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How to DataBind a Wizard control to an ObjectDataSource
Although the Wizard ASP.NET web control cannot be bound directly to an ObjectDataSource, you can use the Wizard in a FormView, thereby databinding the Wizard indirectly.
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ObjectDataSource 'XXX' could not find a non-generic method 'XXX' that has parameters: XXX, XXX, XXX
Error occurs when binding a data control such as a GridView with an ObjectDataSource.
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How to Disable SideBar Links in the ASP.NET Wizard Web Control
Create a SideBarTemplate for your Wizard to control the behavior of Sidebar steps.
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Procedure or function has too many arguments specified
This error may occur when binding a control (GridView, FormView or DetailView) to a SqlDataSource.
1 Scenarios | 3 Solutions
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How to Embed an Image, JavaScript or other file in a Server Control
Using RegisterClientScriptResource and GetWebResourceUrl to embed files in your Web server control is easy (if you know all the steps you need to take to achieve this)
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Simple Method to Rewrite the URL
Re-write URLs without creating a module or using ISAPI filters.
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How to select a dropdownlist item in an EditItemTemplate of a FormView that is bound to an ObjectDatasource
Get the data returned from an ObjectDataSource and select an option in a dropdownlist from the code-behind.
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The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).
The error was thrown while attempting to add an AJAX Extender, such as a Calendar extender, to a textbox.
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How to use a CustomValidator to validate one Web control only if a checkbox or radiobutton is checked.
This article demonstrates how to create client-side and server-side custom validation in a FormView.
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The Visible property of a View control can only be set by setting the active View of a MultiView
The error was thrown when attempting to set a Wizard's SideBarButton's visible property to false or true during it's DataList's ItemDataBound event.
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How to use one FormView template as the InsertItemTemplate and EditItemTemplate
Typically, it is unnecessary to use two different form templates for update and insert operations. The following code snippet demonstrates how to force the FormView control to use a single template for inserts and updates.
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Unable to cast object of type 'ProfileCommon' to type ‘ProfileCommon'
After converting an ASP.NET Web Application from a Web Site to a Web Application, the ProfileCommon class is no longer accessible in code.
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Implicit conversion from data type sql_variant to uniqueidentifier is not allowed. Use the CONVERT function to run this query.
Error occurs when passing the UserId (GUID) as a parameter to a SqlDataSource.
1 Scenarios | 1 Solutions
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Web Control visibility property not consistent with its visibility when a page loads
When debugging code, the "visible" property shows "false" for a Web Control even though the control is visible in the browser before and after the page loads.
1 Scenarios | 1 Solutions
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InvalidOperationException was caught: The Size property has an invalid size of 0
ObjectDataSource update and insert operations throw an error when output parameters are used.
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