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Setting the GridView Selected item to none

I am developing windows 8.1 app using Xaml and c#, Windows 8.1 selectes the first list item when the list loads. How can i Change this so that the list has no selectedItem when it loads.

From MSDN documentation:
Use the SelectedIndex property to determine the index of the currently selected row in a >GridView control. You can also use this property to programmatically select a row in the >control. To clear the selection of a row, set this property to -1.
Source: http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.gridview.selectedindex(v=vs.110).aspx

In my case, setting the SelectedIndex to -1 did not work. If you are populating your GridView from a CollectionViewSource, you have to insert this line in the GridView :
IsSynchronizedWithCurrentItem="False"
From MSDN
Selection behavior and CollectionViewSource
List controls that derive from Selector have a default selection behavior that depends on what the items source is (the type that's used for ItemsSource). If the items source is a CollectionViewSource instance, then the behavior in the selection control is that the selection will default to the current item. When the list is first displayed, the selection defaults to the first item as current item. If you don't want the first item to be selected in this case, set IsSynchronizedWithCurrentItem to false in the GridView.

Display Column information from database into my dropdown

I am trying to display Column information from database into my dropdown. After selecting the item in the dropdown (1) the next dropdown (2) must show the list of items present in selected field..net

If you are using ASP.NET dropdownlist you can set autopostback to true and in the codebehind set the items in the second droplist.

select all items in the listbox in asp.net

if checkbox is clicked i need to select all items in the listbox in asp.net...
how to show the items all selected in listbox once the 'selectall' checkbox is clicked

In the CheckedChanged event handler of the checkbox, iterate through all the items of the list and set the Selected property for all as true. You also need to make sure that the multi selection is enabled on your listbox. Use the following to do that:
...
for(int i=0;i<ListBox1.Items.Count;i++)
{
ListBox1.Items[i].Selected = true;
}
...

You can use the attribute OnClientClick with your ASP.NET Listbox to fire a javascript function that selects all items.
If your ASP.NET Listbox runs on the server, you should refer it in your Javascript using:

C# Databinding SelectedIndexChanged call

I am using a SelectedIndexChanged function for a combobox to update the content of my DataGridview item. I have the combobox data bound to keep track of it's currently selected record. However, when I changed the combobox index it updates the datagridview as if the selected value was the same. This means once I have selected a different index value in the combobox, I have to select it again to run the function with the proper value.
Am I missing something here? Do I need to call the check for the current datarow selected in the combobox before calling the SelectedIndexChanged function?

Sounds like the page life cycle issue, as the datagrid will be fired before the slected index change if its in the page load event. at which point the index wont have changed so the data will be the same.

Retrieve value of most recently SelectedItem from multi-select listbox

How can I retrieve the value of a clicked item in a multi-select listbox?
Currently, if I click one item and use lstBox.SelectedValue, it will return the proper value; however, if I then click on another item, I am still shown the first item's value.
Basically, I want the value of the item most recently clicked on, regardless of whether or not it is the SelectedValue.

If it is a multiple selection listbox, you can get a collection of all the selected items by using SelectedItems instead of SelectedItem.
If you need to know the sequence in which the items were selected, or which was selected most recently, I think you would need to record if yourself by SelectedIndexChanged event.

The SelectedIndexChanged handler will get called when you select/unselect an item in the listbox.
However, it doesn't indicate which one was selected/unselected.
listbox1.SelectedItems
will contain the currently selected items and you could internally keep track of which index was most recently added.