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CoordinateReferenceSystem orgin = new CoordinateReferenceSystemFactory().CreateFromName("EPSG:4326");
CoordinateReferenceSystem des = new CoordinateReferenceSystemFactory().CreateFromParameters("sh", "+proj=tmerc +lat_0=31.23 +lon_0=121.46 +k=1 +x_0=-680 +y_0=-610 +ellps=krass +units=m +no_defs");
var xf = new CoordinateTransformFactory().CreateTransform(orgin, des);
Coordinate oc = new Coordinate(Convert.ToDouble(tb_x.Text), Convert.ToDouble(tb_y.Text));
Coordinate tc = new Coordinate();
var rc = xf.Transform(oc, tc);
tb_r.Text = rc.ToString();