How to set a dropdownlist item as selected in ASP NET

Question

I want to set selecteditem for asp  net dropdownlist control programmatically   So I want to pass a value to the dropdownlist control to set the selected item where is the value of the item equal to the passed value

User · Answer

This is a very nice and clean example  check this great tutorial for a full explanation link   public static IEnumerable lt SelectListItem gt  ToSelectListItems                this IEnumerable lt Album gt  albums  int selectedId        return          albums OrderBy album   gt  album Name                 Select album   gt                     new SelectListItem                                         Selected    album ID    selectedId                       Text   album Name                      Value   album ID ToString                              In this MSDN link you can read de DropDownList method documentation   Hope it helps

User · Answer

Set dropdown property   selected  true

User · Answer

You can set the SelectedValue to the value you want to select  If you already have selected item then you should clear the selection otherwise you would get  Cannot have multiple items selected in a DropDownList  error   dropdownlist ClearSelection    dropdownlist SelectedValue   value    You can also use ListItemCollection FindByText or ListItemCollection FindByValue  dropdownlist ClearSelection      dropdownlist Items FindByValue value  Selected   true       Use the FindByValue method to search the collection for a ListItem   with a Value property that contains value specified by the value   parameter  This method performs a case-sensitive and   culture-insensitive comparison  This method does not do partial   searches or wildcard searches  If an item is not found in the   collection using this criteria  null is returned  MSDN    If you expect that you may be looking for text value that wont be present in DropDownList ListItem collection then you must check if you get the ListItem object or null from FindByText or FindByValue before you access Selected property  If you try to access Selected when null is returned then you will get NullReferenceException   ListItem listItem   dropdownlist Items FindByValue value    if listItem    null        dropdownlist ClearSelection       listItem Selected   true

User · Answer

You can use the FindByValue method to search the DropDownList for an Item with a Value matching the parameter   dropdownlist ClearSelection    dropdownlist Items FindByValue value  Selected   true    Alternatively you can use the FindByText method to search the DropDownList for an Item with Text matching the parameter   Before using the FindByValue method  don t forget to reset the DropDownList so that no items are selected by using the ClearSelection   method  It clears out the list selection and sets the Selected property of all items to false  Otherwise you will get the following exception    Cannot have multiple items selected in a DropDownList

User · Answer

dropdownlist ClearSelection      making sure the previous selection has been cleared dropdownlist Items FindByValue value  Selected   true

[c#] How to set a dropdownlist item as selected in ASP.NET?

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