i want to display a data from the dropdown list

Hello Vamsna,

You just take label at which you want to display that company name.

Then create drop down selected index change event and make auto postback event of dropdown true then write code to print your selected company name at you label like this:
Write this code in .aspx

<asp:DropDownList ID="ddl" OnSelectedIndexChanged="ddl_SelectedIndexChange" runat="server" AutoPostBack="True"> 
</asp:DropDownList>

Write this code in .cs:

protected void ddl_SelectedIndexChange(object sender, EventArgs e)
{
    lbl.text=ddl.SelectedItem.Text
}

Accepts as answer and vote if help to you.

Try like below:

In your aspx page

<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True"
        onselectedindexchanged="DropDownList1_SelectedIndexChanged">
        <asp:ListItem>1</asp:ListItem>
        <asp:ListItem>2</asp:ListItem>
        <asp:ListItem>3</asp:ListItem>
        <asp:ListItem>4</asp:ListItem>
</asp:DropDownList>
    <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

In your aspx.cs page

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        TextBox1.Text = DropDownList1.SelectedItem.Value.ToString();
    }

Reference: how to display selected values from dropdown list asp.net[^]

Hope it helps! :)

aspx page

add onSelectedIndexChanged="comboBoxtest_SelectedIndexChanged" to the combo.

CS File

private void comboBoxtest_SelectedIndexChanged(object sender, EventArgs e)
{
   var combotext = comboBoxtest.Text;     
   label1.Text = combotext ;
}