why i m getting error of invalid column name even when column name is available

Question

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C#

string checkl = "SELECT COUNT(*) FROM Counter WHERE leftcount=1";
                com = new SqlCommand(checkl, con);
                com.CommandType = CommandType.Text;
                da = new SqlDataAdapter(com);
                DataTable dtcheckl = new DataTable();
                da.Fill(dtcheckl);

                int lcount = 0;
                lcount =Convert.ToInt32(dtcheckl.Rows[0]["leftcount"].ToString());//ERROR

i am getting invalid column name error but when i run same query in database i get the output but here in front end i m getting error why?

Posted 22-Nov-12 21:58pm

sumit kausalye

Updated 22-Nov-12 22:46pm

Herman<T>.Instance

v2

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3 solutions

Solution 3

Write your code as below.

C#

string checkl = "SELECT COUNT(*) as CountValue FROM Counter WHERE leftcount=1";
com = new SqlCommand(checkl, con);
com.CommandType = CommandType.Text;
da = new SqlDataAdapter(com);
DataTable dtcheckl = new DataTable();
da.Fill(dtcheckl);
 
int lcount = 0;
lcount =Convert.ToInt32(dtcheckl.Rows[0]["CountValue"].ToString());

This should work.

Posted 22-Nov-12 22:10pm

Mohd. Mukhtar

Updated 22-Nov-12 22:12pm

v2

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Nilesh Rokade · Accepted Answer · 2012-11-22T22:05:00

Solution 1

Because you are referring column in .NET that is not retrived in SQL.
SELECT COUNT(*) FROM Counter WHERE leftcount=1. You are selecting COUNT(*)\
you should be selecting leftcount for using it in Code .

Posted 22-Nov-12 22:05pm

Nilesh Rokade

Comments

sumit kausalye 23-Nov-12 4:08am

but i want count to be fetch so what is solution for that?

sujit0761 · Accepted Answer · 2012-11-22T22:08:00

Solution 2

In the select statement you are getting the count not the column data . you can set the query as

SQL

SELECT COUNT (*) as  leftcount FROM Counter WHERE leftcount=1

Hope you'll get the desired result after modifying your query.

Posted 22-Nov-12 22:08pm

sujit0761

Comments

sumit kausalye 23-Nov-12 4:11am

thank you it worked

sujit0761 23-Nov-12 4:15am

Please rate the solution..if you got it.. :)