Develop Reference

setting selected option in asp.net using c#

I have a following code in aspx page
<asp:DropDownList ID="txtSupplierCountry" class="form-control" Width="230px" runat="server">
<asp:ListItem Text="Select gender" Value="0"></asp:ListItem>
<asp:ListItem Text="male" Value="0"></asp:ListItem>
<asp:ListItem Text="female" Value="1"></asp:ListItem>
</asp:DropDownList>
I have a value in database as male/female. I need to set this text using C# code. Basically I am trying to set selected option based on the text from database. I am not getting an idea. I have tried following code but it doesn't work.
String t = "male" // coming from db
txtSupplierCountry.Items.FindByText(t).Selected = true;

when you are saving data Male and Female then why did you keep dropdown values in number like 1,2 etc, change code like this.
<asp:DropDownList ID="txtSupplierCountry" class="form-control" Width="230px" runat="server">
<asp:ListItem Text="Select Country" Value="0"></asp:ListItem>
<asp:ListItem Text="male" Value="male"></asp:ListItem>
<asp:ListItem Text="female" Value="female"></asp:ListItem>
then
txtSupplierCountry.SelectedValue="male";

Get and split multiple values from database field and view them as selected in a multiple select listbox

I want to get the values in a string from a database which i can do and my result is
string strValues = "'value1','value2','value3'";
i know we can split them using the split function. But the problem is how to mark them in the list box.
<asp:ListBox ID="lstValues" runat="server" SelectionMode="Multiple">
<asp:ListItem Value="-1">[``Select]</asp:ListItem>
<asp:ListItem Value="1">value 10</asp:ListItem>
<asp:ListItem Value="2">value 9</asp:ListItem>
<asp:ListItem Value="3">value 3</asp:ListItem>
<asp:ListItem Value="4">value 2</asp:ListItem>
<asp:ListItem Value="5">value 1</asp:ListItem>
</asp:ListBox>

<asp:ListBox ID="lstValues" runat="server" SelectionMode="Multiple">
<asp:ListItem Value="-1">[``Select]</asp:ListItem>
<asp:ListItem Value="1">value 10</asp:ListItem>
<asp:ListItem Value="2">value 9</asp:ListItem>
<asp:ListItem Value="3">value 3</asp:ListItem>
<asp:ListItem Value="4">value 2</asp:ListItem>
<asp:ListItem Value="5">value 1</asp:ListItem>
</asp:ListBox>
add Selected="true" on the Items you want to be checked!
Example: <asp:ListItem Value="5" selected="true">value 1</asp:ListItem>
you can also use Checked="true" for list boxes

stop autopost back on default value of dropdownlist asp.net

I have a dropdownlist(autopostback enabled) in my project in binded through sqldatasource, i have added an initial value to it using list item. The problem is the page is being postbacked even when selecting the initial value which i dont want. Is there a way to achieve this?
<asp:DropDownList ID="DropDownListTheme" runat="server"
DataSourceID="SqlDataSourceTheme" DataTextField="h_theme"
DataValueField="h_theme" Height="30px" Width="30%"
AppendDataBoundItems="true" AutoPostBack="True">
<asp:ListItem Text="--Select One--" Value="-1" />
</asp:DropDownList>

Set the initial item as selected initially
<asp:ListItem Text="--Select One--" Selected="True" Value="-1" />

Add
onchange="if(this.selectedIndex == 0)return false;"
event to drop down list.

unable to assign value in the dropdownlist in C#

im editing one gridview. while clicking edit im redirecting to one page and binding all the fields. but unble to bind month dropdown . i want to bind april month in dropdown but not binding
<asp:DropDownList ID="DDLMonth" runat="server">
<asp:ListItem>Month</asp:ListItem>
<asp:ListItem Text="January" Value="1"></asp:ListItem>
<asp:ListItem Text="February" Value="2"></asp:ListItem>
<asp:ListItem Text="March" Value="3"></asp:ListItem>
<asp:ListItem Text="April" Value="4"></asp:ListItem>
<asp:ListItem Text="May" Value="5"></asp:ListItem>
<asp:ListItem Text="June" Value="6"></asp:ListItem>
<asp:ListItem Text="July" Value="7"></asp:ListItem>
<asp:ListItem Text="August" Value="8"></asp:ListItem>
<asp:ListItem Text="September" Value="9"></asp:ListItem>
<asp:ListItem Text="October" Value="10"></asp:ListItem>
<asp:ListItem Text="November" Value="11"></asp:ListItem>
<asp:ListItem Text="December" Value="12"></asp:ListItem>
code behind
string DDLMonthstr = date.Month.ToString();//4
DDLMonth.SelectedIndex = Convert.ToInt32(DDLMonthstr);

Try
DDLMonth.Items.FindByValue(string val).Selected = true;

You probably have already selected item and need to clear selection using ListControl.ClearSelection before making new selection through code.
string DDLMonthstr = date.Month.ToString();//4
DDLMonth.ClearSelection();
DDLMonth.SelectedIndex = Convert.ToInt32(DDLMonthstr);
Also check if you are getting any exception by using try-catch block if you do not already have, this could help in fixing.

How to bind existing dropdown list defined in .aspx with C#

I have a dropdown list in design page as shown below:
<asp:DropDownList ID="ddlArtList" runat="server">
<asp:ListItem Value="95">Select</asp:ListItem>
<asp:ListItem Value="1">1</asp:ListItem>
<asp:ListItem Value="2">2</asp:ListItem>
<asp:ListItem Value="3">3</asp:ListItem>
<asp:ListItem Value="4">4</asp:ListItem>
<asp:ListItem Value="5">5</asp:ListItem>
<asp:ListItem Value="6">6</asp:ListItem>
</asp:DropDownList>
This items above are sometimes overridden by some other values in C#, according to the requirement.
But at the end i want to bind the above default items with the help of C# to get the above listitems.
I want to know is there any In-Built method or attribute to bind the dropdownlist(.aspx) in C#.
Without using this: ddlArtList.Items.Add ("1); etc etc.
Thanks in advance.

Use AppendDataBoundItems
.aspx Code:
<asp:DropDownList ID="ddlArtList" AppendDataBoundItems="True" runat="server">
<asp:ListItem Value="95">Select</asp:ListItem>
<asp:ListItem Value="1">1</asp:ListItem>
<asp:ListItem Value="2">2</asp:ListItem>
<asp:ListItem Value="3">3</asp:ListItem>
<asp:ListItem Value="4">4</asp:ListItem>
<asp:ListItem Value="5">5</asp:ListItem>
<asp:ListItem Value="6">6</asp:ListItem>
</asp:DropDownList>
ServerSide:
ddlArtList.AppendDataBoundItems="True"

You can keep the default list in Session during first Page Load -
if(!isPostback)
{
ListItem[] items = new ListItem[ddlArtList.Items.Count];
ddlArtList.Items.CopyTo(items, 0);
Session["ddlArtList"] = items;
}
Now when you want to reset the list -
if(Session["ddlArtList"] != null)
{
ListItem[] items = Session["ddlArtList"] as ListItem[];
ddlArtList.Items.Clear();
ddlArtList.Items.AddRange(items);
}

If you want to append to a default list, use the markup as you provided to set the default list. You will want to set AppendDataBoundItems to true, as already mentioned.
<asp:DropDownList ID="ddlArtList" runat="server" AppendDataBoundItems="true">
<asp:ListItem Value="95">Select</asp:ListItem>
<asp:ListItem Value="1">1</asp:ListItem>
<asp:ListItem Value="2">2</asp:ListItem>
<asp:ListItem Value="3">3</asp:ListItem>
<asp:ListItem Value="4">4</asp:ListItem>
<asp:ListItem Value="5">5</asp:ListItem>
<asp:ListItem Value="6">6</asp:ListItem>
</asp:DropDownList>
In the code-behind, you can set the DataSource to the appended items and simply call DataBind. That will append those items to your dropdownlist.
ddlArtList.DataSource = new List<int>{ 10, 11, 12 }; // replace with actual data source you are using
ddlArtList.DataBind();
Depending on all of your needs, you can add those appended items on the page's Load event or inside another event handler, such as a button click or selecting from another dropdownlist or whatever.