日期值的空文本框

问题描述

我有两个文本框，我插入日期值和一个文本框的名称。当我点击搜索按钮，记录这两个日期显示之间。它正在工作。但是当我没有在日期文本框中插入值，只插入命名文本框并单击搜索按钮，然后它给我error.Error是：字符串未被识别为有效的DateTime。

我必须做什么才能将日期的文本框清空。

这里是我的代码...

i have two textbox in wich i insert date value and one textbox for name.when i click on search button, record bettween this two date display.it is working.But when i not insert value in date textbox and insert only in name textbox and click on search button,then it gives me error.Error is:String was not recognized as a valid DateTime.
what i have to do to take textbox of date empty.
here is my code...

protected void btnSearch_Click(object sender, EventArgs e)
{
    objdal2.Name = txt_Searchname.Text;
    objdal2.DateFrom =Convert.ToDateTime(txt_SearchDateFrom.Text);
    objdal2.DateTo =Convert.ToDateTime(txt_SearchDateTo.Text);
    objdal2.LeaveType = ddlLeaveType.SelectedItem.Text;
    objdal2.Approve =Convert.ToBoolean(ddlApprove.SelectedItem.Text);

   dv= objdal2.Search_Data();
   GridView1.DataSource = dv;
   GridView1.DataBind();
   lblmsg2.Text = "Total Records: " + count;
}

推荐答案

if (string.IsNullOrWhitespace(txt_SearchDateFrom.Text) || string.IsNullOrWhitespace(txt_SearchDateTo.Text))
   {
   MessageBox.Show("Please enter a form and a to date");
   return;
   }

但这并不能阻止他们进入垃圾场。我会使用它，加上我会使用TryParse：

But that doesn''t stop them entering rubbish. I would use that, plus I would use TryParse:

if (DateTime.TryParse(txt_SearchDateFrom.Text, out objdal2.DateFrom) &&
    DateTime.TryParse(txt_SearchDateTo.Text, out objdal2.DateTo))
   {
   ...
   }

但我的首选是完全不使用TextBoxes来防止这两个问题！您是否考虑过DateTimePicker？这样，用户就无法输入无效日期，您也无需进行任何转换。

But my preference would be to prevent both problems altogether by not using TextBoxes at all! Have you considered a DateTimePicker instead? That way, the user can''t enter an invalid date, and you don''t have to do any conversion.

if(textbox.text=="")
{

textbox.text=Todaysdate;
}
else
{
 textbox.text="what ever your passing through text box value only"
}

它只会工作试着让我知道

....

It will work just try and let me know
....

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