Default.aspx
<body>
<form id="form1" runat="server">
<div>
<div>Bind Your Selected DropDownlist to Textbox.</div>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionString %>"
SelectCommand="SELECT [PlaceCode], [PlaceName] FROM [Place]"></asp:SqlDataSource>
<asp:DropDownList ID="mydropdown" runat="server" AutoPostBack="True" OnSelectedIndexChanged="mydropdown_SelectedIndexChanged" DataSourceID="SqlDataSource1" DataTextField="PlaceName" DataValueField="PlaceCode">
</asp:DropDownList>
<asp:TextBox ID="myTextBox" runat="server"></asp:TextBox>
</div>
</form>
</body>
p/s:Remeber set your dropdownlist autopostback to true
Default.aspx.cs
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
}
}
protected void mydropdown_SelectedIndexChanged(object sender, EventArgs e)
{
myTextBox.Text = mydropdown.SelectedItem.Text;
}
}
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