Hi sidu,
TextBoxFor helper method is a strongly typed extension method. It generates a text input element for the model property specified using a lambda expression.
TextBoxFor method binds a specified model object property to input text. So it automatically displays a value of the model property in a textbox and visa-versa.
Ex:
@Html.TextBoxFor(m => m.DurationInMinutes, new { id = "txtduration", @class = "form-control txtOnlyNumber", maxlength = "30" })
In the above example, the first parameter in TextBoxFor() method is a lambda expression which specifies DurationInMinutes property to bind with the textbox.
2nd parameter is htmlAttributes defines space for assign id, class etc.
For more details refer below article.
