help with my error

[jochen29]

my erro:

Value cannot be null.
Parameter name: dataSet

heres my code:

[code2=vbnet]Private Sub btnSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSave.Click



Dim da As New MySqlDataAdapter("Update personalinfo, schoolinfo set sno = '" & txtSno.Text & "',
lastname = '" & txtLastName.Text & "',
middlename = '" & txtMiddleName.Text & "',
gender = '" & cmbGender.Text & "',
dateofbirth = '" & txtBirthday.Text & "',
school = '" & txtCollege.Text & "',
course = '" & cmbCourse.Text & "',
department = '" & txtDepartment.Text & "',
dateenrolled = '" & txtEnrolled.Text & "',
yeargraduated = '" & txtGraduated.Text & "',
where no = '" & txtSno.Text & "'", MySQLConn)

da.Fill(ds)
Me.Hide()

frmMain.showData()[/code2]

im trying to edit and save the info here.. the error appears above.