组合框焦点未设置

Question

I am trying to set combobox box in constructor. But some how it's not set true so, Required field validation is fired and I am not able to change value of combobox. Based on combobox selection Controls is hide and show. My code is :

public CompanyAddEdit(MainForm form, int totalItems)
{
    passedForm = form;
    InitializeComponent();            
    BindCompanyType();
    Id = totalItems;
    xmlDocPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Companies.xml");
    xDocument = XDocument.Load(xmlDocPath);   
    cmbbx_companyType.Focus();
}

Answer 1

There are two approaches you can do to have the combobox focused on the constructor.

1. Set the Tabindex property of the combobox to the lowest.
2. You can call the cmbbx_companyType.Select() to set the focus after it is visible.

Here is an updated snippet of your code with Select() :

public CompanyAddEdit(MainForm form, int totalItems)
{
  passedForm = form;
  InitializeComponent();            
  BindCompanyType();
  Id = totalItems;
  xmlDocPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Companies.xml");
  xDocument = XDocument.Load(xmlDocPath);   
  cmbbx_companyType.Select();
}