User-1038772411 posted
Hello aalmeidaovar,
As we checked in asp.net web form application you can set Text area using below <asp:TextBox>
.aspx page
<asp:TextBox id="TextArea1" TextMode="multiline" Columns="40" Rows="3" runat="server" />
in code behind you can get and set value using below.
.cs page
TextArea1.Text = "Hello Text"; //For the set text
string enteredTextArea1 = TextArea1.Text; //For the get text
If you still facing any issue please let us know.
Thanks.