database - Retrieve data from Db set by combobox and display to textbox -

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this code 

s2="select notes atotalno =" + combobox1.selecteditem +""  dim cmd oledbcommand=new oledbcommand(s2,myconnection1)  cmd.commandtext=s2 textbox1.text=convert.toint32(cmd.executescalar()).tostring()

and getting following error:-

erorr: data type mismatch in criteria expression

apply tostring() on selecteditem , why convert result set integer, if want show in textbox?

try this,

s2 = "select notes atotalno = "& combobox1.selecteditem.tostring() &""   dim cmd oledbcommand = new oledbcommand(s2, myconnection1)  cmd.commandtext = s2  textbox1.text = "" & cmd.executescalar()

here resultset concatenated empty string make whole string.

if column atotalno of type varchar decorate selecteditem value single quotes. like,

s2 = "select notes atotalno = '"& combobox1.selecteditem.tostring() &"'"

hope helps thanks.


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