Attach listbox to textbox

In that case you need to attach a TextChanged event on your TextBox and inside that, put the following logic:

private void txtBx_TextChanged(object sender, EventArgs e)
{
// Clear the selection for every new character entered
cmbBx.SelectedItem = null;

// get the list from ComboBox
var itemList = cmbBx.Items;

    // Iterate each element in the comboBox to check which element has TextBox substring
    foreach(var item in itemList)
    {
        if (item.ToString().Contains(txtBx.Text))
        {
            // If found show that item on the ComboBox and exit the loop
            cmbBx.SelectedItem = item;
            break;
        }
    }
}

If it helps you, please mark it accepted answer.

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Hemant Srivastava13y ago
In that case you need to attach a TextChanged event on your TextBox and inside that, put the following logic:

private void txtBx_TextChanged(object sender, EventArgs e)
{
    // Clear the selection for every new character entered
    cmbBx.SelectedItem = null;
    // get the list from ComboBox
    var itemList = cmbBx.Items;
    // Iterate each element in the comboBox to check which element has TextBox substring
    foreach(var item in itemList)
    {
        if (item.ToString().Contains(txtBx.Text))
        {
            // If found show that item on the ComboBox and exit the loop
            cmbBx.SelectedItem = item;
            break;
        }
    }
}

If it helps you, please mark it accepted answer.