From Gridivew displaying the record in chart in asp.net using csharp

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C#

Code as follows

In Gridview as follows

Class   Batchno  Rate

AFF     B101     70
MFA     B102     60
ROC     B103     50

From Gridview i am displayed into chart using asp.net in CSharp.for that code as follows

string[] LClass = new string[GridView3.Rows.Count];
string[] LRate = new string[GridView3.Rows.Count];
for (int icount = 0; icount <= GridView3.Rows.Count; icount++)
{
    LClass[icount] = GridView3.Rows[icount].Cells[0].Text.ToString();
    LRate[icount] = GridView3.Rows[icount].Cells[2].Text.ToString();
    Chart1.Series.Add(LClass[icount].ToString());
}

when i execute the error shows as follows

Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index


please help me what is the problem in my code