嗨，当我尝试从文本框中捕获日期时，当我尝试观看该参数时，它显示错误

Question

当我尝试从文本框中捕获日期时，当我尝试观看该参数时显示错误

  

（无法计算表达式，因为线程在某一点停止   垃圾收集是不可能的，可能是因为代码是   优化。）

DateTime logstartdate = Convert.ToDateTime(txtfromdate.Text);
DateTime logenddate = Convert.ToDateTime(txttodate.Text);

DateTime logfdate = Convert.ToDateTime(txtfromdate.Text);
DateTime logtdate = Convert.ToDateTime(txttodate.Text);
DateTime stdate = Convert.ToDateTime(txtstartdate.Text);

DateTime startdate = Convert.ToDateTime(txtstartdate.Text);
DateTime closedate = Convert.ToDateTime(txtenddate.Text);
if (logfdate <= stdate && stdate >= logtdate)
{
    lblmessage.Visible = true;
    lblmessage.Text = "Sorry!start date must be in between the log start date and log end date";
    return;
}