How to set thailand character in textbox using keyboard in winform in C#

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C#

Hi,

In winform I have created one combobox and one textbox, I want while inputing through keyboard, it should be written in Thailand language, but it coming in English language bydefault. Please suggest

Thanks & Regards
Bikram

What I have tried:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace ThailandChar
{
public partial class Form2 : Form
{
public Form2()
{
InitializeComponent();

foreach(InputLanguage lng in InputLanguage.InstalledInputLanguages)
{
comboBox1.Items.Add(lng.Culture.DisplayName);
}

comboBox1.SelectedIndex = 0;
}

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
foreach (InputLanguage lng in InputLanguage.InstalledInputLanguages)
{
if (lng.Culture.DisplayName == comboBox1.Text)
{
InputLanguage.CurrentInputLanguage = lng;
}
}

}
}
}