主界面是一个groupBox1，点不同的按钮groupBox1会出现不同的Forms.UserControl。我想判断某一个Forms.UserControl里面的DateEdit的值是否为空
private bool ControlContent_Config(System.Windows.Forms.UserControlpage)
{
int nPageControls = page.Controls.Count;
for (int i = 0; i < nPageControls; i++)
{
if (page.Controls is DateEdit)
{
DateEdit txt_def= (page.Controls as DateEdit);
string txt_value = txt_def.DateTime.ToString().Trim();
if(txt_value == ""
{
MessageBox.Show("请确定数据项不为空！","提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
txt_def.Focus();
return false;
}
