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Select specific text from a TextBox on Tapped event

This is a UWP app.
I'm trying to select text with a single tap while having buttons that allow a user to differentiate if they want to select a word, sentence, paragraph, or page. I can get the pointer position and the text inside the textbox but I can't find any reasonable way to associate the two.
Is there a property or method that I'm missing which will allow me to get perhaps an index position in the textbox where the pointer currently is?

If you do not have anything selected currently (SelectionLength = 0), then the SelectionStart Property will return the index of the item that matches your cursor position.
https://learn.microsoft.com/en-us/uwp/api/windows.ui.xaml.controls.textbox.selectionstart?view=winrt-20348

dynamic search in file using c#

/*I am reading many files and getting data through File.ReadAllLines. Now I want to search in these files for a specific string written in a textbox. Whenever I put some text in the textbox it must return lines of text containing that word. I am coding in textchanged property but it is not successful as it gives me a result even when I press backspace or add any other word. */
I have successfully made it to work. I was clearing the listbox every time it runs else statement. Now I just want you people to tel me what should I do to make it work fast.

if you don't want to get the result right away when you type something in Textbox then put Button on your form and try this code:
string[] lines=File.ReadAllLines(path);
var result = lines.Where(l => l.Contains("text")).ToList();
I hope this helps

Get position of selected text in string in textbox

Ok, I'm trying to do something a little specific here. I want to get the location of the selected text in a textbox.
To elaborate- I can use location to select text. If I have a textBox1 I could do:
textBox1.SelectionStart = 1;
textBox1.SelectionLength = 4;
That would start at the second letter and select 4 letters.
What I want to do is the opposite: when the user selects text, I want to find out what the start is and what the length is (or what the start is and what the end is. Either will work).
I thought about just searching the string for the selectedtext (textBox1.SelectedText). The problem comes if it is a common word or a string that is used multiple times. For instance.
This is a cat. This is a cat. This is a cat.
If they select the second sentence, using SelectedText to search the string for that specific sentence does me no good. It could be either of the 3.
So, my question is: When the user clicks a button, how do I determine the exact elements that are selected by the user, so that I can later manipulate those specific elements? Important to note the later part- I likely will not only want to manipulate the text when the button is pressed. I will also want to manipulate it later, at a time when the text may no longer be highlighted. This means I'll want to store SOMETHING to tell me what specific parts of the sentence I'm dealing with. If that solution isn't viable, is there a solution you can think of where, in the above "this is a cat" example, the user could select the second sentence, hit a button, and then later I know which sentence was selected when he hit that button?

According to the documentation, SelectionStart and SelectionLength can be both set and read. Just use those.

You dont even need to know the position of selected text to manipulate them, to edit the text that you have selected in the text you can simple set the SelectedText property to the new edited value.
// if textBox1.text = "Hello World World"; with first "World" selected
textBox1.SelectedText = textBox1.SelectedText.Replace("World", "Raj");
// then it becomes "Hello Raj World"

Get current line's text (where the caret is blinking) of richtextbox

I really need to get the contents of the line where the caret is blinking in a rich text box control. Suppose I have the following text in a rich text box:
This
is
a
test
I would like to retrieve the text of line 2 by providing its index (for example 2 or 1 if the function is zero-based).
Thanks in advance,
Vali

I'm not sure if the question's title and what you really want to know are the same... If you want to get a line given its index, check the Lines property of the RichTextBox.
http://msdn.microsoft.com/en-us/library/system.windows.forms.textboxbase.lines.aspx

Make sure you have the WordWrap for the text box set to false to make sure the index of the line corresponds to the line where the caret is.
Try this:
var pos = richTextBox1.GetLineFromCharIndex(this.richTextBox1.SelectionStart);
MessageBox.Show(richTextBox1.Lines[pos]);

you can do it
richTextBox1.Lines[1]

Issue with textbox rounding a number

I have the following code:
txtbox1.Text = listView1.SelectedItems[0].SubItems[11].Text;
The value of the selected item of the listview is "33,5" but when the code reachs this line, in the textbox writes 34,00.
I don't know why if there's a text inside a text, I have tried convertingo to decimal before asing to the textbox but still put 34,00. I've tried too puting 33.5 instead of 33,5 but then the code writes in the textbox: 3350,0.
What can I do?
Thanks

try this:
string number = listView1.SelectedItems[0].SubItems[11].Text;
and check in debug mode what number contains.
I am convinced you have the right value in there, a simple string, but the txtbox1 is applying certain formatting on text change. You should find this out and fix the way content of txtbox1 is formatted after assignment.