How to update column of database where id of column is equal to dropdownlist1.items

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Hi All. I have page in asp.net Website. My database has table with 3 columns.
Id(int) , title(varchar), state_p(int). default value of state_p = 0 .

I Have GridView with Checkbox within it

I want for each row in Grid View rows when checked of CheckBox1 is true then return id of rows in DropDownList1. This code done it successfully:

C#

foreach (GridViewRow gvr in GridView1.Rows)
        {
            if (((CheckBox)gvr.FindControl("CheckBox1")).Checked == true)
            {
                string data;
                data = gvr.Cells[0].Text;
                DropDownList1.Items.Add(data);
            }
        }

The problem is that I want to update state_p columns in my database to “1” WHERE id= '" + DropDownList1.Items + "'.
How can I do that. Please help me.

What I have tried:

how to update column of database where id of column is equal to DropDownList1.Items

Posted 22-Jun-16 6:15am

rezaeti

Updated 23-Jun-16 7:02am

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Comments

Vincent Maverick Durano 22-Jun-16 15:07pm

You would need to iterate the items in dropdownlist. Within the loop you could construct your update query and execute it at once in your database.

Maciej Los 23-Jun-16 2:11am

What have you tried? Where are you stuck?

1 solution

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User 9916080 · Answer 1 · 2016-06-23T07:02:00

If you are using dynamic SQL by building it in the application, you can do something like this; however, this will only work setting the state_p to 1. You will need to also put in code to reverse. What if the state_p is one, but needs to be zero (unchecked).

** Use this only to step through to see how the code is building the data for the where clause. To properly execute any SQL should be to build a list of values and pass those values to a method, which executes a stored procedure or function on the database server. **

C#

StringBuilder sql = new StringBuilder();

sql.Append(" UPDATE  <TABLE>");
sql.Append(" SET state_p = 1 ");
sql.Append(" WHERE id IN ("

foreach (GridViewRow gvr in GridView1.Rows)
        {
            if (((CheckBox)gvr.FindControl("CheckBox1")).Checked == true)
            {
                string data;
                data = gvr.Cells[0].Text;
				sql.Append(data + ",");
                DropDownList1.Items.Add(data);
            }
        }
		
 string exeSql = sql.ToString().Substring(0, sql.Length - 1) + ")";

//Execute the sql statment by using exeSql;