Drop Down

 Add items to list

dropboxId.Items.Add("ABC");

Add textbox value to drop down

dropboxId.Items.Add(txtId.Text);

Source Code

<body>
    <form id="form1" runat="server">
        <div>

            <asp:DropDownList ID="drpDwnDemo" runat="server" Height="16px" Width="133px">
                <asp:ListItem Value="1">A</asp:ListItem>
                <asp:ListItem Value="2">B</asp:ListItem>
                <asp:ListItem Value="3">C</asp:ListItem>
            </asp:DropDownList>
            <asp:Button ID="btnTest" runat="server" OnClick="btnTest_Click" Text="Check"
                Style="font-weight: 700" />

            <br />
            <br />
            HOW TO SELECT <b>VALUE</b> IN A DROP DOWM<br />

            <asp:DropDownList ID="drpDwnDemo0" runat="server" Height="16px" Width="133px">
                <asp:ListItem Value="1">A</asp:ListItem>
                <asp:ListItem Value="2">B</asp:ListItem>
                <asp:ListItem Value="3">C</asp:ListItem>
            </asp:DropDownList>
            <asp:Button ID="btnValue" runat="server" OnClick="btnValue_Click" Text="Value"
                Style="font-weight: 700" />

            <asp:TextBox ID="txtValue" runat="server"></asp:TextBox>
            <br />
            <br />
            <br />
            <br />
            HOW TO SELECT <b>TEXT</b> IN A DROP DOWM<br />

            <asp:DropDownList ID="drpDwnDemo1" runat="server" Height="16px" Width="133px">
                <asp:ListItem Value="1">A</asp:ListItem>
                <asp:ListItem Value="2">B</asp:ListItem>
                <asp:ListItem Value="3">C</asp:ListItem>
            </asp:DropDownList>
            <asp:Button ID="btnText" runat="server" OnClick="btnText_Click" Text="TEXT"
                Style="font-weight: 700" />

            <asp:TextBox ID="txtText" runat="server"></asp:TextBox>

        </div>
    </form>
</body>



C# Codes

protected void btnTest_Click(object sender, EventArgs e)
        {
            if (drpDwnDemo.SelectedValue=="1")
            {
                Response.Write("<script>alert('A')</script>");//print message as script

            }
            else if (drpDwnDemo.SelectedValue == "2")
            {
                Response.Write("<script>alert('B')</script>");//print message as script

            }
            else if (drpDwnDemo.SelectedValue == "3")
            {
                Response.Write("<script>alert('C')</script>");//print message as script

            }
        }

        protected void btnValue_Click(object sender, EventArgs e)
        {
           string value= drpDwnDemo0.SelectedValue;
           txtValue.Text = value;
        }

        protected void btnText_Click(object sender, EventArgs e)
        {
            string value =Convert.ToString (drpDwnDemo1.SelectedItem);
           txtText.Text = value;
        }

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