In this Post
Update Attendance Button Click Event and User Defined Function to Update Data in Database

Important NameSpaces Used
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using System.Data;
using System.Data.SqlClient;


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Update Attendance Button Click Event
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foreach (GridViewRow row in GridView1.Rows)
        {
            CheckBox status = (row.Cells[3].FindControl("CheckBox1") as CheckBox);
            int rollno = Convert.ToInt32(row.Cells[1].Text);
            if (status.Checked)
            {
                updaterow(rollno, "true");
            }
            else
            {
                updaterow(rollno, "false");

            }



        }


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User Defined Function to Update Data in Database
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 private void updaterow(int rollno, String markstatus)
    {
        String mycon = "Data Source=sk-pc; Initial Catalog=StudentAttendance; Integrated Security=True";
        String updatedata = "Update attendancedetail set attendancemark='" + markstatus + "' where rollno=" + rollno;
        SqlConnection con = new SqlConnection(mycon);
        con.Open();
        SqlCommand cmd = new SqlCommand();
        cmd.CommandText = updatedata;
        cmd.Connection = con;
        cmd.ExecuteNonQuery();
        Label2.Text = "Data Has Been Saved Successfully";
    }