How to get values from list and put it in where condition

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.NET4.6

I have datagridview have check boxes checked

but my problem how to update checked box values from datagridview in database .

C#

button1_click event
{   
        string subjId;   
        List<string> lines = new List<string>();   
        for (int i = 0; i < gvSubjectsList.Rows.Count; i++)   
        {   
       bool Ischecked =Convert.ToBoolean(gvSubjectsList.Rows[i].Cells["Select"].Value);    
            if (Ischecked == true)   
            {   
                subjId = gvSubjectsList.Rows[i].Cells["SubjectId"].Value.ToString();   
                lines.Add(subjId);   
            }   
    }
   //update courses set courseStatus = true where subjId found in lines

    }

my problem how to

//update courses set courseStatus = true where subjId found in lines

How to write query select in c# to get what numbers found in list ?

update courses set courseStatus = true where ??????

what i write in place of ?????????

thanks

What I have tried:

How to get values from list and put it in where condition

Posted 1-May-18 15:44pm

ahmed_sa

Updated 1-May-18 17:24pm

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Wendelius · Answer 1 · 2018-05-01T17:26:00

Probably the easiest way would be to do updates individually, inside the loop. This would mean that you prepare the SQL statement and create the parameters outside the loop and inside the loop you set the values for parameters and execute the statement.

Another option would be to gather the keys inside the loop and when done, use an IN comparison in the SQL statement. In other words something like

SQL

UPDATE mytable SET column = value WHERE keycolumn IN (@key1, @key2, @key3...)

To make this easier you can create the parameters and set their values inside the loop.

For a concrete example for the first option, have a look at Properly executing database operations / Use prepare for repeated statements[^]