i want to select those value is gave by user from textbox

Question

protected void btn2_Click(object sender, EventArgs e)

{

string man = txt2.Text;

string[] match = man.Split(',');

int i = match.Length;

for (int count = 0; count < i; count++)

{

var a = ltb1.Items.FindByText(match[i].ToString());

if (a.Text == man)

{

ltb1.SelectedValue = a.Value;

}