Question about gridview in asp.net

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C#

I have write the below code to update to update data of gridview row... int ID = int.Parse((sender as LinkButton).CommandArgument);here ID is the datakey name..when i click the link button to update 2 row of gridview..then ID which is datakey name of 2nd row comes correct...but the problem is that by doing this it update string id,name and attendance of first row. datakey name value is of 2nd row...by doing this it update data of first row instead of second....
any solution or sugesstion???????

string Id = row.Cells[0].Text;
                string name = row.Cells[1].Text;
                CheckBox attendance = row.FindControl("status") as CheckBox;

protected void Update(object sender, EventArgs e) 
    {
        int ID = int.Parse((sender as LinkButton).CommandArgument);



        foreach (GridViewRow row in GridView2.Rows)
        {
            
            
            if (row.RowType == DataControlRowType.DataRow)
            {
               
               
                string Id = row.Cells[0].Text;
                string name = row.Cells[1].Text;
                CheckBox attendance = row.FindControl("status") as CheckBox;

                if (attendance.Checked)
                {

                    IITBAL.Attendance.UpdateAttendance(ID,Semester.Text.ToString(), Course_Name.Text.ToString(), SessionId.ToString(), Id.ToString(), name.ToString(), date.Text.ToString(), 1);
                    return;
                }
                else
                {
                    IITBAL.Attendance.UpdateAttendance(ID,Semester.Text.ToString(), Course_Name.Text.ToString(), SessionId.ToString(), Id.ToString(), name.ToString(), date.Text.ToString(), 0);
                    return;
                }

              
            }

         
        }
        Response.Redirect("Faculty Manage Attendance.aspx");
       
       
    }