c# - Missing operand after '=' operator -

i have line of code uses dataview view_1 , i'm trying filter datagridview product_name , size using rowfilter. here code:

view_1.rowfilter = "product_name = '" + cboproduct.text + "' , size = " + cbosize.text + "";

and when try run application says missing operand after '=' operator. missing operand?

~~you have missing white-space @ 'and~~

so replace

'and

with

' ,

is size string-column or int-column? if it's string need quotation marks around too:

and size = '" + cbosize.text + "'";

or better, use string.format others have commented since insreases readability:

view_1.rowfilter = string.format("product_name = '{0}' , size = '{1}'"             , cboproduct.text             , cbosize.text);

KHS