Develop Reference

How to sort textboxes and buttons selection order?

I have a program like this:
When user is filling the form by pressing Tab button in keyboard, he should go to next button or textbox as shown in the image by red numbers.
But now after filling number 2, when I press Tab, it select a row in gridview!
After that... how can I sort this?

With the form open, go to the menu View -> Tab Order:
This then displays the current tab ordering on your form:
By clicking on the controls, you can define a new tab ordering:

You have to set the TabIndex property of your controls. TabStop must be set to true. When pressing Tab, controls will be selected in the order of the TabIndex values you set.
Note that you do not need to set consecutive tab indices. You could even assign the same index to multiple controls. See this link for the exact behaviour.

select buttons orderly in userControl by press Tab key

I have a UserControl with some buttons in it (btnNew, btnCancel, btnEdit).
I used this UserControl in another project. When I press the tab key in this project, the selection button doesn't change regular!
For example, I want that if the user presses the Tab key, first the btnNew button is selected, then the btnEdit button, and finally the btnCancel button.
But in this project, when pressing the Tab key, the btnCancel button is selected first.
I want to manage the tab order of the buttons myself, and not use the default. How can I do this?
Thanks...

To set the order of how the buttons will be selected on tab press use the property
TabIndex
it defines the order the tabs will be selected. So set the tab index like the following
btnNew.TabIndex = 0;//selected first
btnCancel.TabIndex = 1;//the second
btnEdit.TabIndex = 2;//the last one

When the form designer is open go to View > Tab Order this will allow you to set the tab order in a very simple and easy way.
Refer this:http://msdn.microsoft.com/en-us/library/bd16a8cw(v=vs.90).aspx

I don't have much knowledge on Windows Forms, As I know there will be a TabIndex property for each control.
You can set your order using that.

Menu View-> TabOrder
or
manually set TabIndex for each control.

To set the tab order of a control
On the View menu, click Tab Order. This activates the tab-order selection mode on the form. A number (representing the TabIndex
property) appears in the upper-left corner of each control.
Click the controls sequentially to establish the tab order you want.
When you have finished, click Tab Order on the View menu again to leave tab order mode.
Quoted from here.
You could also change the TabIndex property of each of the controls individually in the Properties pane. Or change it programatically like so btnNew.TabIndex = 0;.

Textbox focus skipping on pressing TAB

I have app where I have multiple textboxes and I would like to do when the user is focused in one textbox when he presses TAB button on keyboard I would like to skip the focus into other textbox which I will set.
Is there any way to do that easily? I have 20 textboxes in this form and I need it to skip from textbox1 to textbox2 to textbox3....textbox20 when press the TAB key.

First of all you have to set the tab index of each text box,
you can set either from the properties window (for each textbox ) or set by selecting the menu
view->Taborder.
you can set the tab index and by pressing the Tab key the control wil automatically transfer from 1 textbox to another.

Sounds like you're looking for the TabIndex property, which is an integer value you can assign to controls either in code or in the designer properties window:
http://msdn.microsoft.com/en-us/library/system.windows.forms.control.tabindex.aspx
See also the TabStop property:
http://msdn.microsoft.com/en-us/library/system.windows.forms.control.tabstop.aspx
Example:
TextBox1.TabIndex = 2;
TextBox2.TabStop = false;
TextBox3.TabIndex = 99;
With focus on TextBox1, pressing tab will jump to TextBox3, then back to TextBox1, and obviously TextBox2 is skipped.

in c# every Control has a property called tabStop and tabIndex
setting the tabIndex one after the other will make that when you press tab from one one textBox you'll get focus on the other
if you want a control not to get focus when pressing tab, though i'm not sure u want, but your question isn't clear on that so i didn't want you to miss it, put true in tabStop

Inserting tabs in a textbox

This is going to turn out to be simple, I'm sure, but I couldn't find anything on Google about this. I have a Winforms application that has a textbox. When I hit the TAB key, the cursor is jumping to the next control. What I want instead is for an actual tab (or 4 spaces) to be inserted into my textbox. What property am I missing?

You should set the AcceptsTab property to true on your TextBox. This will insert an actual TAB character.
From the MSDN page:
The Multiline property must also be true to get a TAB character in the control.
If the AcceptsTab property is set to true, the user must press CTRL+TAB to move the focus to the next control in the tab order.

How to prevent a gridview to get focus?

I have 2 grids. When user is doing edits in one grid, I want to disable the other grid from getting focus, or atleast other grid from changing its foccussed row.
Example:
Parent grid, children grid.
If user is making edit in children of particular parent. I want to prevent user from suddenly shifting focus to different parent row. how to do that ?

The only ways you can prevent a control receiving focus is to change it's Enabled or Visible properties.
Simply changing the parent's Enabled property to "false" (e.g. for the CellBeginEdit) and then back to "true" (e.g. in the CellEndEdit event) will prevent the user from selecting a new parent row.

There are a lot of ways to do this but thats how I would do it (just a concept so ignore if any property does not match):
Create a property called mode and then use enumeration to set it to Edit or None etc.
Suppose you have GridViewParent and GridViewChild. In the FocusedRow event of child grid, at the start of all code, set the value of mode to Edit and at the end of all code in the event set it to None.
Then in the FocusedRow event of parent grid check whether the mode value is edit or not, if it is edit then use e.Cancel or something to get out of the focused event of the parent.
Now if you let me know exactly which grid are you using I might send you the code.