Calculate distance between two locations (Latitude and Longitude) without using Google API in ASP.Net

Hi nauna,

Use the GeoCoordinate class GetDistanceTo method to calculate the distance.

Note : GeoCoordinate class is available in .NET Framework 4 and higher. 

Add the System.Device reference from the .Net tab in your project to access GeoCoordinate class.

Check this example. Now please take its reference and correct your code.

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    double lat1 = 19.154732;
    double long1 = 72.856847;
    double lat2 = 19.174410;
    double long2 = 72.860479;
    System.Device.Location.GeoCoordinate source = new System.Device.Location.GeoCoordinate(lat1, long1);
    System.Device.Location.GeoCoordinate destination = new System.Device.Location.GeoCoordinate(lat2, long2);
    double distance = source.GetDistanceTo(destination);
    Response.Write(Math.Round(Convert.ToDecimal(distance / 1000), 2) + " Kms.");
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    Dim lat1 As Double = 19.154732
    Dim long1 As Double = 72.856847
    Dim lat2 As Double = 19.17441
    Dim long2 As Double = 72.860479
    Dim source As Device.Location.GeoCoordinate = New Device.Location.GeoCoordinate(lat1, long1)
    Dim destination As Device.Location.GeoCoordinate = New Device.Location.GeoCoordinate(lat2, long2)
    Dim distance As Double = source.GetDistanceTo(destination)
    Response.Write(Math.Round(Convert.ToDecimal(distance / 1000), 2) & " Kms.")
End Sub

Output

2.22 Kms.