i have following error pls help me to resolve it

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i have following code

C#

string SqlQuery = "Update " + frmmain.CityName + " set  assignedtouserid='" + frmmain.UserName + "', flag=1 where flag=0 and city like '%" + newcituname + "%' ORDER BY LOCALITY DESC limit 100 ";
               LeptonDataLayer.ExecuteNoneQuery(1, SqlQuery);

but when i m run it it give following error like this

""Object reference not set to an instance of an object.""

Posted 30-Jul-14 20:12pm

Member 10891595

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PrakashCs.net 1-Aug-14 8:07am

debug your code and check which property is null either 1.frmmain.CityName 2.frmmain.UserName 3.newcituname or LeptonDataLayer

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**Nirav Prabtani** · Answer 1 · 2014-07-31T23:54:00

First remove order by and limit from update query, There is nothing need of it and it never works also.

C#

SqlConnection cn = new SqlConnection("ConnectionString");
           string SqlQuery = "Update tableName set  assignedtouserid='" + frmmain.UserName + "', flag=1 where flag=0 and city like '%" + newcituname + "%'";
           SqlCommand cmd = new SqlCommand(SqlQuery, cn);
           cn.Open();
           cmd.ExecuteNonQuery();