Insert multiple data into a single cell SQLyog vb.net - vb.net

Question

I am trying to develop a management system for dentists, this the system i am developing
THIS MY PROGRAM'S SCREENSHOT
when the dentist inputted a data on a textbox, it will be saved on the database and whenever the dentist insert a data again on that textbox, instead of replacing the older data with a newer data, it will store the data, making the cell store multiple data
and this is my code for adding data into the table
table name: teethhistory
database name: PatientManagementSystem
Private Sub txtURThirdMolar_KeyDown(sender As Object, e As KeyEventArgs) Handles txtURThirdMolar.KeyDown
If e.KeyCode = Keys.Enter Then
MySqlConn.Open()
query1 = "SELECT * FROM teethhistory WHERE Patient_ID_Number ='" & lblID.Text & "'"
cmd1 = New MySqlCommand(query1, MySqlConn)
reader = cmd1.ExecuteReader
If reader.HasRows Then
Dim i As Integer
With cmd
.Connection = MySqlConn
.CommandText = "UPDATE teethhistory SET Up_Right_3rd_Molar ='" & txtURThirdMolar.Text & "' WHERE Patient_ID_Number = " & lblID.Text
reader.Close()
i = .ExecuteNonQuery
End With
If i > 0 Then
MsgBox("Updated!", MsgBoxStyle.Information, "Success")
Else
MsgBox("Failed", MsgBoxStyle.Information, "Failed")
End If
Else
Dim cmd As MySqlCommand = MySqlConn.CreateCommand
cmd.CommandText = String.Format("INSERT INTO teethhistory (Patient_ID_Number, Fullname, Up_Right_3rd_Molar )" &
"VALUES ('{0}' ,'{1}' ,'{2}')",
lblID.Text,
lblFullname.Text,
txtURThirdMolar.Text)
reader.close()
Dim affectedrows As Integer = cmd.ExecuteNonQuery()
If affectedrows > 0 Then
MsgBox("Saved!", MsgBoxStyle.Information, "Success")
Else
MsgBox("Saving failed.", MsgBoxStyle.Critical, "Failed")
End If
MySqlConn.close()
End If
End Sub

Answer 1

if you want to Append the Existing text In field with new data from textbox,use Update command as
.CommandText = "UPDATE teethhistory SET Up_Right_3rd_Molar = concat('" & txtURThirdMolar.Text & "',Up_Right_3rd_Molar) WHERE Patient_ID_Number = " & lblID.Text
for inserting values seperated by commas, just insert a comma before the string ion concat function.
hope i undestood your problem well and this solves it.