Web Forms :: Scaling Of Only Y-Axis In Chart

I am using asp chart (framework 4.0) in one of the web page.

Chart displays x and y points from database.I want to fix the scaling of only Y-axis i.e., between 1 to -1as y axis point will lie within 1 to -1, as below:

10.750.500.250      ------------------------------------------------0.25-0.50-0.75-1

C# code:

Chart1.Visible = true;
string id = Request.QueryString[1].ToString();
string query = "SELECT x,y from Table where ID= '" + id + "' and DeletionDate is null";
DataTable dt = GetData(query);

string[] x = new string[dt.Rows.Count];
double[] y = new double[dt.Rows.Count];

[Code].....