How to bind Label with Database in ASP.net with C#

Have a read of Two-Way Data Binding in ASP.NET[^]
 
** UPDATE **
You are trying to use WinForm data binding with a WebForm this does not work.
If you read the article you should have read the section entitled "Simple DataBinding - a (brief) refresher" and seen the DataBinder.Eval() Method[^] which is what is used to databind controls in WebForms.
 
To use the DataBinder.Eval() method in CodeBehind;

TextBox1.Text = DataBinder.Eval(ds.Tables["Products"].DefaultView[0], "ProductName").ToString();

This method also has the option to specify a format string;

TextBox2.Text = DataBinder.Eval(ds.Tables["Products"].DefaultView[0], "ProductPrice", "{0:c}"); //Display using currency format

 
If however all you want is to do is change the text of a label based on a database field you could just use string.Format() like;

Label1.Text = string.Format("{0}", ds.Tables["Products"].DefaultView[0]["Description"]);

 
Keep in mind that WebForm databinding does not work the same way as WinForm databinding and attempt to comprehend how things work.