TextBox Leave Event Is not working properly

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C#

WinForms

controls

I am creating a window based application for stock Management in C#. In this application i have a form StockEntryMaster and there is 8-9 textBoxes in the form. On one textbox there is textbox leave event is activated, for the very first time this event work very fine but next item again i enter some value in that textbox the events won't work as expected. Actually the text Leave event isn't fired.

Here i am providing the code for my textbox leave event

private void txtItemCode_Leave(object sender, EventArgs e)
        {
            getItemList();

        }

and code for function getListItem code is below

public void getItemList()
        {
            DataTable dt = new ItemGroupOp().getItems(txtItemCode.Text);
            if (dt.Rows.Count > 0)
            {
                txtItemName.Text = dt.Rows[0]["ItemName"].ToString();
                txtItemGroup.Text = dt.Rows[0]["ItemGroup"].ToString();
            }
            else
            {
                MessageBox.Show("No Item exists for this ItemCode");
            }
        }

So please suggest me the solution so that i can make my project better and it works fine.
Thanks in advance