I Have Following Error When I Converting Following

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when i am executing the following code i got following error please help me to short these

ERROR::::::"String was not recognized as a valid Boolean."

my code is that

bool value = Convert.ToBoolean("select EXISTS(Select * from information_schema.tables where table_schema='public' and table_name='" + ddlCityName.Text + "')");

Posted 13-Aug-14 19:47pm

Member 10891595

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Ashi0891 14-Aug-14 2:15am

what are you actually trying to do here?
and why are you doing it this way?

Member 10891595 14-Aug-14 2:17am

i want to check the table that are present in database or not this query return me boolan value

so i can use this boolean value in if -else control

3 solutions

Solution 1

Try this one

SQL

SELECT cast(case WHEN Exists(Select * from information_schema.tables where table_name='" + ddlCityName.Text + "')
            THEN 1 
            ELSE 0 
            END as bit)

Posted 13-Aug-14 20:15pm

Sreejesh T J Nair

Updated 13-Aug-14 20:21pm

v2

Solution 3

Use this code I think this may help you.

C#

string str="select EXISTS(Select * from information_schema.tables where table_schema='public' and table_name='" + ddlCityName.Text + "')"
 SqlCommand cmd = new SqlCommand(str, con);
 SqlDataAdapter da = new SqlDataAdapter(cmd);
 DataSet ds = new DataSet();
 da.Fill(ds);
int val=(convert.toint32(ds.tables[0].row[0][0]);
bool value = Convert.ToBoolean(val);

select as answer if its helps you.

Posted 13-Aug-14 20:47pm

ErBhati

v2

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Bernhard Hiller · Accepted Answer · 2014-08-13T20:32:00

Solution 2

Well, look: You create the text of an SQL query.
What's the next step then?
You have to send the query to the database to retrieve the result from the database.
And only then can you convert the result from the database to the Boolean variable.

Posted 13-Aug-14 20:32pm

Bernhard Hiller