I don't know what's your error is but as i am not that much good with VB coding i will post the sample code for inserting values try this and let me know
"INSERT INTO Customers(col1,col2,col3,col4,col5,col6,col7,col8,col9,col10,col11) VALUES(" & _
"'" & txtData1.Text & "'," & _
"'" & txtData2.Text & "'," & _
"'" & txtData3.Text & "'," & _
"'" & txtData4.Text & "'," & _
"'" & txtData5.Text & "'," & _
"'" & txtData6.Text & "'," & _
"'" & txtData7.Text & "'," & _
"'" & txtData8.Text & "'," & _
"'" & txtData9.Text & "'," & _
"'" & txtData10.Text & "'," & _
"'" & txtData11.Text & "')"
Paste your controls instead of mine and give it a try