How to change font size according to drop down list selection in C#

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How to change font size according to drop down list selection in c# ?

I want the user to make selection according the drop down list and it will appear on my text box.

What I have tried:

PrimaryStyle.Font.Size = FontUnit.Parse(FontSizeList.SelectedItem.Text);
            lblMessage.ApplyStyle(PrimaryStyle);
            txtMessage.ApplyStyle(PrimaryStyle);

Posted 15-Dec-17 9:21am

Member 13572556

Updated 18-Dec-17 7:13am

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Richard Deeming 18-Dec-17 13:37pm

REPOST
This is now your THIRD copy of the same question:
https://www.codeproject.com/Questions/1220790/How-to-make-a-message-board-where-user-have-access[^]
https://www.codeproject.com/Questions/1221335/How-to-change-the-textbox-value-when-selecting-the[^]

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Laxmidhar tatwa technologies · Answer 1 · 2017-12-18T07:13:00

html code bellow

<br /><br /><br />
      <asp:Label ID="lblMessage" runat="server" Text="this is the text for testing"></asp:Label>
       <br /><br />
       <div>
            <asp:DropDownList ID="ddlfont" runat="server"  AutoPostBack="true" OnSelectedIndexChanged="ddlfont_SelectedIndexChanged">
               <asp:ListItem Text="10" Value="10"></asp:ListItem>
               <asp:ListItem Text="12" Value="12"></asp:ListItem>
               <asp:ListItem Text="14" Value="14"></asp:ListItem>
           </asp:DropDownList>

       </div>

Code behind is bellow

private Style primaryStyle = new Style();
      protected void Page_Load(object sender, EventArgs e)
      {

      }

      protected void ddlfont_SelectedIndexChanged(object sender, EventArgs e)
      {
          primaryStyle.Font.Size = FontUnit.Parse(ddlfont.SelectedItem.Text);
          lblMessage.ApplyStyle(primaryStyle);

      }