How to add additional attributes to a dropdown created using an HTML helper?

I have two dropdowns created using HTML helpers, however i am not entirely sure on where i could add additional attributes to these two helpers? More specifically, i want to add an “onblur” attribute that calls a javascript function, as follows:

@onblur = "validate3(1)"

I want to be able to give the following HTML Helper dropdowns the above attribute:

@Html.DropDownList("ExpMonth", new List<SelectListItem>
                                {
                                    new SelectListItem { Text = "01", Value = "1"},
                                    new SelectListItem { Text = "02", Value = "2"},
                                    new SelectListItem { Text = "03", Value = "3"},
                                    new SelectListItem { Text = "04", Value = "4"},
                                    new SelectListItem { Text = "05", Value = "5"},
                                    new SelectListItem { Text = "06", Value = "6"},
                                    new SelectListItem { Text = "07", Value = "7"},
                                    new SelectListItem { Text = "08", Value = "8"},
                                    new SelectListItem { Text = "09", Value = "9"},
                                    new SelectListItem { Text = "10", Value = "10"},
                                    new SelectListItem { Text = "11", Value = "11"},
                                    new SelectListItem { Text = "12", Value = "12"}
                                }, "MM")

                                @Html.DropDownList("ExpYear", new List<SelectListItem>
                                {
                                    new SelectListItem { Text = "2020", Value = "1"},
                                    new SelectListItem { Text = "2021", Value = "2"},
                                    new SelectListItem { Text = "2022", Value = "3"},
                                    new SelectListItem { Text = "2023", Value = "4"},
                                    new SelectListItem { Text = "2024", Value = "5"},
                                    new SelectListItem { Text = "2025", Value = "6"},
                                    new SelectListItem { Text = "2026", Value = "7"},
                                    new SelectListItem { Text = "2027", Value = "8"},
                                    new SelectListItem { Text = "2028", Value = "9"},
                                    new SelectListItem { Text = "2029", Value = "10"},
                                    new SelectListItem { Text = "2030", Value = "11"},
                                }, "YY")

Any help is appreciated.

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Answers:

Method 1

Answers:

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Method 1

Try

@Html.DropDownList("ExpMonth", new List<SelectListItem>{
    new SelectListItem { Text = "01", Value = "1"},
    new SelectListItem { Text = "02", Value = "2"},
    new SelectListItem { Text = "03", Value = "3"},
    new SelectListItem { Text = "04", Value = "4"},
    new SelectListItem { Text = "05", Value = "5"},
    new SelectListItem { Text = "06", Value = "6"},
    new SelectListItem { Text = "07", Value = "7"},
    new SelectListItem { Text = "08", Value = "8"},
    new SelectListItem { Text = "09", Value = "9"},
    new SelectListItem { Text = "10", Value = "10"},
    new SelectListItem { Text = "11", Value = "11"},
    new SelectListItem { Text = "12", Value = "12"}
}, "MM", new{@onblur = "validate3(1)"})

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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