ASP.NET Web Pages with Razor - asp.net

Question

how to get the name of select tag and use to if condition here is my code:
#{
var size="";
if(Request.Form["cboSize"] == "Extra Small (XS)"){
size = "Extra Small (XS)";
}
...
}
<select name="cboSize">
<option value="xs">Extra Small (XS)</option>
<option value="s">Small (S)</option>
<option value="m">Medium (M)</option>
<option value="l">Large (L)</option>
<option value="xl">Extra Large (XL)</option>
</select>

Answer 1

You need to wrap your select node in a form to get its value from Request.Form["cboSize"]:
<form method="POST">
<select name="cboSize">
<option value="xs">Extra Small (XS)</option>
<option value="s">Small (S)</option>
<option value="m">Medium (M)</option>
<option value="l">Large (L)</option>
<option value="xl">Extra Large (XL)</option>
</select>
<input type="submit" />
</form>
Then in your code:
public async Task<IActionResult> OnPostAsync()
{
var size = Request.Form["cboSize"];
//do something with it asyncronously
return RedirectToPage($"/Details/{size}");
}