How to stop on selection of dropdownlist in Index view from going to a controller specified in Html.BeginForm?

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MVC4

ASP.NET4

i have a Form which contains cascading dropdown lists now i want to call a controller on the selection of first DDL passing the selection id to it.
I also have a Submit button which will be used to post the form but when i select an item from DDL the form is posted

Quote:

@using (Html.BeginForm("Details", "Home", FormMethod.Post))
{
@Html.Partial("_District")
@Html.Partial("_Tehsil")
@Html.Partial("_SubTehsil")
}


<input type="submit" value="Check" />

I want to post the form on the button submit but somehow it is getting posted when i select an item from District DDL

Now in _District.cshtml view i have which is almost same for _tehsil and _subtehsil Views ...

Quote:

<select name="district" id="Districtddl" class="ddl">
option value="0">---Select District---</option>
@foreach (System.Data.DataRow dr in FarmerRegisterFormAndPrint.Models.StoredProcedures.GetAllDistrict().Rows)
{
<option value='@dr["DistrictId"].ToString()'>@dr["DistrictName"].ToString()</option>
}
</select>

Also any idea how to implement Cascading dropdown list on registeration form using mvc ajax