Conversion failed when converting the varchar value 'System.Collections.Generic.List`1[System.Int32]' to data type int. error is coming

Question

0.00/5 (No votes)

See more:

Hello, Please solve this error.
my code is

C#

con.Open();
        using (SqlCommand cmd = new SqlCommand("select ID from Vendor_gatepass where GatePass_Status='Close' and Vendor_GatePass='" + Gatepass.Text + "'", con))
        {
            SqlDataReader dr1 = cmd.ExecuteReader();
            List<int> list = new List<int>();
            if (dr1.HasRows)
            {
                while (dr1.Read())
                {
                    list.Add(Convert.ToInt32(dr1[0]));
                }
            }
            Session["ID"] = list;

            dr1.Close();


            string query = "update Product_Details set [GatePass status]='Close' where ID in ('"+Session["ID"]+"')";
            SqlCommand comdd = new SqlCommand(query, con);
            comdd.ExecuteNonQuery();
            con.Close();
    }}

Posted 5-Jan-15 22:45pm

Member 10578683

Add a Solution

Comments

Arjsrya 6-Jan-15 4:56am

What error are you getting exactly?Did you check the value while debugging in the while loop?Please check Null before adding it into the List.

2 solutions

Solution 2

Debug your code and check the line

C#

list.Add(Convert.ToInt32(dr1[0]));

Also CAST your Session["ID"] into int While passing to the Update query.

Hope it helps :)

Posted 5-Jan-15 23:01pm

Sanket Saxena

Comments

Tejas Vaishnav 6-Jan-15 5:32am

Just casting is not enough for inline query, as list is object of C# and you are using it in your SQL server, so it will not understand it's list or any thing. so you need to pass any string with comma separation in WHERE ID IN (...) cause.

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Tejas Vaishnav · Accepted Answer · 2015-01-05T22:56:00

Have you debug your code and check what the value is coming in dr1[0], you got the error from there.

and also your query

SQL

string query = "update Product_Details set [GatePass status]='Close' where ID in ('"+Session["ID"]+"')";

I think you need to update data with using IN cause, so you need to convert your list of id to coma separated string for applying it in WHERE ID IN ('....') cause.

and modified query looks like this..

SQL

string query = "update Product_Details set [GatePass status]='Close' where ID in ("+ string.Join(",", (List<int>)Session["ID"]) +")";</int>