Hi, I try to use SQL query to use ASP.NET

Question

1.00/5 (1 vote)

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I need to count how many values from each Columns. but I know how to use Sql query,

but I don't know how to use, C# from Asp.net. I was using Entityframwork.

I tried some of C# coding, but it is now working for me.

In C# coding, my Counts is always '0'.

Please help me.

What I have tried:

SELECT
    SUM(CASE WHEN [Column1] = 'jin' THEN 1 ELSE 0 END +
        CASE WHEN [Column2] = 'jin' THEN 1 ELSE 0 END +
        CASE WHEN [Column3] = 'jin' THEN 1 ELSE 0 END) AS COUNTS
FROM 
    Time

Gentle db = new Gentle();
           Time ec = new Time();

            for (int i = 0; i < 4; i++)
            {
                
                
                if (ec.Column1 == "jin")
                {
                    counts= counts + 1;

                }
            }

Posted 1-Jul-20 9:07am

SangYong Jin

Updated 2-Jul-20 7:12am

RedDk

v2

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Comments

Richard Deeming 3-Jul-20 7:05am

If your SQL query is returning 0, then there are no matching records in your table. You will need to check your data to find out what the problem is - we can't do that for you.

Alternatively, if the query returns the correct value but you're struggling to call it from C#, you'll need to show the code you've tried and explain where you're stuck.

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Praveen_P · Answer 1 · 2020-07-02T05:29:00

Solution 1

Hi,

Can you try like this

First you need to load values to a datatable , then

int count = dt.Select().Where(s => s["Column1"].ToString().ToLower() == "jin").Count();

If you need check multiple columns then repeat the step ang find the total

Posted 2-Jul-20 5:29am

Praveen_P