Get Value OnTextChanged using Class File in ASP.Net

Hi SUJAYS,

Please refer below sample.

HTML

Name:
<asp:TextBox runat="server" ID="txtMessage" OnTextChanged="ChangeValue" AutoPostBack="true" />
<asp:Label ID="lblMessage" runat="server" />

Code

StringClass.as

public class StringClass
{
    public string GetString(string message)
    {
        return message;
    }
}

CS.aspx.cs

protected void ChangeValue(object sender, EventArgs e)
{
    StringClass sc = new StringClass();
    string value = sc.GetString(txtMessage.Text);
    lblMessage.Text = "Name is :<b> " + value + "</b>";
}

Screenshot