c# - Error - No value given for one or more required parameters -


i have problem working on project.

i'm trying read data excel file. works fine when i'm trying select rows greater col1value after add and gender = " + gender; gives me error "no value given 1 or more required parameters" cannot set specific gender column because different on every excel file although column name same , error appears when i'm trying fill dataset. 

if (boxgender.text != "")  string gender = boxgender.text; string col1name = lbl1stcolumn.text;   string query = "select * [data$] " +                 col1name + " > " + col1value +                 " , gender = " + gender;                                                 oledbdataadapter dacol1 = new oledbdataadapter(query, con);                             column1data.clear();     dacol1.fill(column1data)     lblstucount1col.text = column1data.tables[0].rows.count.tostring();

i think might missing quotes in sql query:

string query = "select * [data$] " + col1name + " > '" + col1value + "' , gender = '" + gender +"'";

note single quote (') symbols added.


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