serializing an object in C#

I have a serializable class named DataSource:

namespace GraphLib { public struct cPoint { public float x; public float y; } [Serializable] public class DataSource { public delegate String OnDrawXAxisLabelEvent(DataSource src, int idx); public delegate String OnDrawYAxisLabelEvent(DataSource src, float value); public OnDrawXAxisLabelEvent OnRenderXAxisLabel = null; public OnDrawYAxisLabelEvent OnRenderYAxisLabel = null; private cPoint[] samples = null; private int length = 0; private String name = String.Empty; private int downSample = 1; private Color color = Color.Black; public float VisibleDataRange_X = 0; public float DY = 0; public float YD0 = -200; public float YD1 = 200; public float Cur_YD0 = -200; public float Cur_YD1 = 200; public float grid_distance_y = 200; // grid distance in units ( draw a horizontal line every 200 units ) public float off_Y = 0; public float grid_off_y = 0; public bool yFlip = true; public bool Active = true; private bool YAutoScaleGraph = false; private bool XAutoScaleGraph = false; public float XAutoScaleOffset = 100; public float CurGraphHeight = 1.0f; public float CurGraphWidth = 1.0f; public float InitialGraphHeight = 0; public float InitialGraphWidth = 0; public bool AutoScaleY { get { return YAutoScaleGraph; } set { YAutoScaleGraph = value; } } public bool AutoScaleX { get { return XAutoScaleGraph; } set { XAutoScaleGraph = value; } } public cPoint[] Samples { get { return samples; } set { samples = value; length = samples.Length; } } public float XMin { get { float x_min = float.MaxValue; if (samples.Length > 0) { foreach (cPoint p in samples) { if (p.x < x_min) x_min=p.x; } } return x_min; } } public float XMax { get { float x_max = float.MinValue; if (samples.Length > 0) { foreach (cPoint p in samples) { if (p.x > x_max) x_max = p.x; } } return x_max; } } public float YMin { get { float y_min = float.MaxValue; if (samples.Length > 0) { foreach (cPoint p in samples) { if (p.y < y_min) y_min = p.y; } } return y_min; } } public float YMax { get { float y_max = float.MinValue; if (samples.Length > 0) { foreach (cPoint p in samples) { if (p.y > y_max) y_max = p.y; } } return y_max; } } public void SetDisplayRangeY(float y_start, float y_end) { YD0 = y_start; YD1 = y_end; } public void SetGridDistanceY( float grid_dist_y_units) { grid_distance_y = grid_dist_y_units; } public void SetGridOriginY( float off_y) { grid_off_y = off_y; } [Category("Properties")] // Take this out, and you will soon have problems with serialization; [DefaultValue(typeof(string), "")] [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)] public String Name { get { return name; } set { name = value; } } [Category("Properties")] // Take this out, and you will soon have problems with serialization; [DefaultValue(typeof(Color), "")] [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)] public Color GraphColor { get { return color; } set { color = value; } } [Category("Properties")] // Take this out, and you will soon have problems with serialization; [DefaultValue(typeof(int), "0")] [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)] public int Length { get { return length; } set { length = value; if (length != 0) { samples = new cPoint[length]; } else { // length is 0 if (samples != null) { samples = null; } } } } [Category("Properties")] // Take this out, and you will soon have problems with serialization; [DefaultValue(typeof(int), "1")] [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)] public int Downsampling { get { return downSample; } set { downSample = value; } } } } 

and i want to serialize it in a form like this:

public partial class Form1 : Form { public GraphLib.PlotterDisplayEx display; private void serialize() { System.IO.Stream TestFileStream = System.IO.File.Create(@"C:\Users\Public\Documents\test.txt"); System.Runtime.Serialization.Formatters.Binary.BinaryFormatter serializer = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter(); serializer.Serialize(TestFileStream, display.DataSources[0]); TestFileStream.Close(); } 

not that DataSource class that i want to serialize in Form1, is one of the attributes in GraphLib.PlotterDisplayEx class but when i run the program it gives me the following error:

An unhandled exception of type 'System.Runtime.Serialization.SerializationException' occurred in mscorlib.dll Additional information: Type 'KTK.Form1' in Assembly 'KTK, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' is not marked as serializable. 

UPDATE I updated the code for DataSource class.now it's complete code guys.