mjhjmtu

i want to capture selected date on my dropdown list, where there 5 day will display on dropdownlist. im usually put default value on dropdown, but not this time because in drop down list i want it always display current daya and next 5 day. but i dont know how to capture the data.

<asp:DropDownList ID="ddldate" runat="server">
 </asp:DropDownList>

 protected void Page_Load(object sender, EventArgs e)
 
 List<ListItem> items = new List<ListItem>();

 for (int i = 0; i < 5; i++)
 
 items.Add(new ListItem(DateTime.Now.AddDays(i).ToShortDateString(), DateTime.Now.AddDays(i).ToShortDateString()));
 
 ddldate.DataSource = items;
 ddldate.DataBind();
 ddldate.Items[0].Selected = true;
 

 protected void Button1_Click(object sender, EventArgs e)
 
 string deliverytime = ddldate.SelectedValue.ToString();
 lbltest.Text = deliverytime;

 

You're repopulating the DropDownList for every postback and reloading the page, hence SelectedValue property value may be different from posted value. Just put a check against IsPostBack to prevent repopulating DropDownList data on postback:

protected void Page_Load(object sender, EventArgs e)

 if (!IsPostBack)
 
 List<ListItem> items = new List<ListItem>();

 for (int i = 0; i < 5; i++)
 
 items.Add(new ListItem(DateTime.Now.AddDays(i).ToShortDateString(), DateTime.Now.AddDays(i).ToShortDateString()));
 

 ddldate.DataSource = items;
 ddldate.DataBind();
 ddldate.Items[0].Selected = true;
 

You should not bind data on PostaBack, change your FormLoad code to below sample:

protected void Page_Load(object sender, EventArgs e)

 if(!Page.IsPostBack)
 
 List<ListItem> items = new List<ListItem>();

 for (int i = 0; i < 5; i++)
 
 items.Add(new ListItem(DateTime.Now.AddDays(i).ToShortDateString(), DateTime.Now.AddDays(i).ToShortDateString()));
 
 ddldate.DataSource = items;
 ddldate.DataBind();
 ddldate.Items[0].Selected = true;
 

If you check the PostBack property as condition, your SelectedValue will keep, otherwise DropDown will bind on each page-post.

And I also recommend you to check SelectedValue status before use it, don't try to get value if this null, check the following code:

protected void Button1_Click(object sender, EventArgs e)

 if(ddldate.SelectedValue != null)
 
 string deliverytime = ddldate.SelectedValue.ToString();
 lbltest.Text = deliverytime;