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UWP GridView get number of items in row

I have a GridView in c# UWP, that has some items in it (let's say, its filled up with 100 items). I want the GridView to support the arrow-keys on the keyboard. In order to select the item above my current item, I need to know how many items are in one row.
How do I get the number of items in a row?

GridviewCombobox values showing in Different Place

I have a problem with GridViewComboBox column. For each row in GridViewComboBox has different items. When I select an item in first row of GridViewComboBox the items are displayed under the GridViewComboBox correctly but for the second time the the items are displayed at some other place of windows form and not in the GridView.
Any idea why this is happening?

Windows 8 ListView (multiple selection) unselect all items expect latest selected?

I am using ListView with SelectionMod = Multiple, According to the client's requirement I am in a situation where I want to Deselect All items in listview except lastest selected,
if I change selection Mod programmatically to single, it deselects all items but the selected item is then the first one(that I selected first time) not the last.

SelectionChanged event is fired every time you select or deselect one item in ListView. So you can keep this one in separate property, then deselect everything and set this one as selected.
Don't forget to check if item was selected and not deselected.

Count the number of selected rows in a DataGridView

How to count the number of selected rows in a DataGridView?
Let's say I highlighted 5 rows, how can I show it in message box?
Please help I'm using WinForms in C#!

you need to set YourGridView.MultiSelect=true; MultiSelect
When the MultiSelect property is set to true, multiple elements (cells, rows, or columns) can be selected in the DataGridView control. To select multiple elements, the user can hold down the CTRL key while clicking the elements to select. Consecutive elements can be selected by clicking the first element to select and then, while holding down the SHIFT key, clicking the last element to select.
then you can use SelectRows.Count property SelectedRows
MessageBox.Show(yourDataGridView.SelectedRows.Count.ToString());

In VB.NET you can use a Lambda expression. Should be easy to translate to C:
SelectedRowCount = DataGridView1.SelectedCells.OfType(Of DataGridViewCell)().Select(Function(x) x.RowIndex).Distinct().Count()

Delete Multiple Records from ListView in ASP.NET using CheckBox in ListView

Using confirmation before delete from ListView using C#. I have a ListView with CheckBox in it and I want to Delete the Items/Records from ListView which are selected with CheckBox in to it.
i.e Multiple select items and then Delete these Multiple Records from ListView
Any Idea?

would have left this as a comment but for some reason, I can't find where to add a comment...
The ListView control has a CheckedItems collection which you can iterate through, something like:
For Each lvi As ListViewItem In ListView1.CheckedItems
lvi.Remove()
Next

foreach(ListViewItem In ListView1.CheckedItems lvi)
{
lvi.Remove()
}