I have a few textboxes inside an UpdatePanel that are used to calculate values in some labels. Each time a user exits a textbox, the server needs to make some calculations and change the values on the labels. After it does the calculations and comes back, I would like the next textbox to have focus. I would like to make it so that the user can tab between textboxes. Currently, when I leave a textbox, everything loses focus and I have to select the next textbox myself. I have tried to use a variable to set the focus in the Page_load, but it doesn't seem to help. I am using Master Pages, that might be a cause of the problem, but I am not sure.

Any help?

Use the SetFocus method of page and pass the textbox to the method.

sujitm:

Use the SetFocus method of page and pass the textbox to the method.

Okay, when the cursor leaves each textbox, I have a Session("TextBox") variable that indicates which TextBox should be next to have focus.

On the page load, I select case the Session variable and it detects and reads the Me.SetFocus("TextBox1") code, however it does not actually set the focus on the page.

More Thoughts?

For partial postbacks, use the SetFocus() method of the ScriptManager control on your page. 

Use

 this.ScropManager.SetFocus(textBox.ClientId)

Let me know if this helpful to you

In that case use ScriptManager.SetFocus method with the ID of your control.

The scriptmanager resides on the Master page. How can I reference the scriptmanager from a content page?

1. Use <Master> page directive in the ASPX page and set the VirtualPath and TypeName attribute of the MasterPage correctly.
2. Define a public property in the master file say. ScriptManager etc.
3. Now, you should be able to access the ScriptManager property in the content pages.

sm.SetFocus(Control);

ScriptManager scriptManager = ScriptManager.GetCurrent(Page);

scriptManger.SetFocus(textBox.ClietId); 

chetan.sarode:

ScriptManager scriptManager = ScriptManager.GetCurrent(Page);

scriptManger.SetFocus(textBox.ClietId); 

ScriptManager.SetFocus() requires a parameter with type of Control, not a control's client ID.  The previously posted method is the correct way to do it. 

chetan.sarode:

Use

 this.ScropManager.SetFocus(textBox.ClientId)

Let me know if this helpful to you

The above code worked perfectly for me since my control is in the content page.