How to make bold and italic font style of selected text in richtextbox at run time..

Hi..
sir I have retrieved items in comboxbox from database like this...

SELECT UPPER(item_Name) as Item_Name FROM New_Item_ForShop order by Item_Name asc

now I want to select the data as Alphabetically I mean if I press G in keyboard than select the series of G in combox..

thanks for helping almost...
Kindly further help

Try this 
public partial class Form1 : Form
{
Font myFont = new Font("Arial", 16,FontStyle.Italic);

public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{
this.KeyPreview = true;

}


private void Form1_KeyDown(object sender, KeyEventArgs e)
{
if (e.Modifiers== Keys.Control && e.KeyCode== Keys.B)
{
richTextBox1.SelectionFont = myFont;
}
}


private void bttnLoad_Click(object sender, EventArgs e)
{
richTextBox1.LoadFile("test.rtf");
}

private void bttnSaveToFile_Click(object sender, EventArgs e)
{
richTextBox1.SaveFile("test.rtf");
}

private void bttnSaveToDatabase_Click(object sender, EventArgs e)
{
string rtfStr = this.richTextBox1.Rtf;//text only
//save to database

}

Thanks..
Working properly as required.

but now I want to save in database as some portion is bold and some regular format..

kindly help.

Try this
public partial class Form1 : Form
{
Font myFont = new Font("Arial", 16,FontStyle.Italic);

public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{
this.KeyPreview = true;
}

private void Form1_KeyDown(object sender, KeyEventArgs e)
{
if (e.Modifiers== Keys.Control && e.KeyCode== Keys.B)
{
richTextBox1.SelectionFont = myFont;
}
}



}