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How to save array value in session

asudhaa asked
Last Modified: 2012-06-27
I have created dynmic textboxes and I would like to save and retrieve the textbox values using session.
         I would like to save the textbox values in array .Have this in session and the retrieve this array values in another button click function.
         I used the below code.But I get the error "NullReferenceException was Unhandled by user code " when I try to save the values.

         How can I rectify this error and save the textbox values in an array?

The code is as below:

  protected void saveBtn_Click(object sender, EventArgs e)
            int counter1 = 1;
            string controlid1 = string.Empty;
            ArrayList arrList = (ArrayList)Session["array"];    
            for (int j = 0; j < ((a)*(b - 1)); j++)
                    controlid1 = "textbox" + counter1.ToString();
                    Table t = PlaceHolder1.FindControl("tablee") as Table;
                    TextBox tb = t.FindControl(controlid1) as TextBox;
                    // Use Session
                    Session["array"] = arrList;
                    counter1 = counter1 + 1;
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