sql server - How to set the code to update the table in database -


i'm making system using visual studio express 2012 , use microsoft sql server have in visual studio think. problem is, when i'm trying run system,an error occur said "operator '&' not defined types 'string' , 'system.windows.forms.datagridview'." code.

imports system.data.sqlclient public class registration     dim cn new sqlconnection("data source=(localdb)\v11.0;attachdbfilename=c:\users\user_pc\desktop\for fyp\computer lab requirement system\fyp3\fyp3\fyp.mdf;integrated security=true")     dim cmd new sqlcommand     dim dr sqldatareader     private sub registration_load(sender object, e eventargs) handles mybase.load         cmd.connection = cn     end sub  private sub btnregisterl_click(sender object, e eventargs) handles btnregisterl.click     if txtidl.text <> "" , txtusernamel.text <> "" , txtpasswordl.text <> ""         cn.open()         cmd.commandtext = "update info set id = '" & txtidl.text & "',user = '" & txtusernamel.text & "',pass = '" & txtpasswordl.text & "'where id =  '" & form1.datagridview1 & "' "         cmd.executenonquery()         cn.close()         txtidl.text = ""         txtusernamel.text = ""         txtpasswordl.text = ""     end if end sub end class

i'm glad if there 1 me explain , teach me whats wrong coding above. i'm new in thing. thanks. :)

you hold primary key of data in gridview in 1 of columns , use in query, instead of below line have:

 "'where id =  '" & form1.datagridview1 & "' "

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