how to focus textbox

Hi Kiran,
use the same code below


and don't forget to give tab index in order for the textboxes
code :
using System.ComponentModel;


using System.Data;


using System.Drawing;


using System.Linq;


using System.Text;


using System.Threading.Tasks;


using System.Windows.Forms;


namespace WindowsFormsApplication1






{




public partial class Form1 : Form






{




public Form1()






{


InitializeComponent();


}




private void Form1_Load(object sender, EventArgs e)






{


textBox1.Focus();


}


}


}

Us e the below code
Textbox1.focus();

When you click on the TextBox, it already gets the focus and you do not need to write any other code to set the focus to it. 

Secondly, for us to work on it and help you out, you need to provide the code you're using and the framework you're using also matters, changing the border in ASP.NET is totally different as compared to changing the border in WPF or Win Forms etc. In ASP.NET you can use the CSS styling techniques to change the border of the TextBox (in HTML form it is an input element), whereas in WPF or Win Forms you need to change the parent property of the TextBox (that is the Border which wraps it). 


Have a look at this MSDN link for more on this topic: https://msdn.microsoft.com/en-us/library/system.windows.controls.textbox(v=vs.110).aspx