how to check folder exist and create a folder

i have this task checking the folder if exist and if not create a folder. This is simple.

First i need to create a form with 1 textbox, button and a label in my page. I named the textbox as txtFolderName, button btnCheckandCreate and the label as lblMessage so now, I need to put the event in my button on click.. on the onclick eventon the button i need to put the code.

protected void btnCheckandCreate _Click(object sender, EventArgs e)
{
lblMessage.Text = "";

if (!System.IO.Directory.Exists(@"c:\" + txtFolderName.Text.ToUpper() + ""))
{
System.IO.Directory.CreateDirectory(@"c:\" + txtFolderName.Text.ToUpper() + "");
}
else {
lblMessage.Text = txtFolderName.Text + " is available";
}
}

Thats it. its so simple. at first i need to set the lblmessage to set to empty then check the inputed if is the folder exist and if not it will create a folder on it else put an message that the foldername is existing. hope this help.