How do I convert a varchar value to data type int (in C#)

Question

0.00/5 (No votes)

See more:

VS2012

SQL-Server-2012

Hi all,
I am new in the team and new in C#, so below i have this code, i am trying to pass values from gridview to the database... so, I am getting this message: "Conversion failed when converting the varchar Valor value to data type int"
I appreciate your help, thanks

C#

System.Data.SqlClient.SqlConnection sqlConnection1 = new System.Data.SqlClient.SqlConnection
(@"Data Source=HP\SQLEXPRESS;Initial Catalog=Storebook;User ID=****;Password=********");

            System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand();
            cmd.CommandType = System.Data.CommandType.Text;
            cmd.CommandText = "INSERT INTO Itens (Price) " +
                    "VALUES ('@Num')";
            cmd.Connection = sqlConnection1;

            sqlConnection1.Open();

            for (int i = 0; i < itensDataGridView.Rows.Count; i++)
            {
                cmd.Parameters.Clear();
                int Valor = Convert.ToInt32(itensDataGridView.Rows[i].Cells[1].Value);
                cmd.Parameters.AddWithValue("@Price", Valor);

                cmd.ExecuteNonQuery();
                sqlConnection1.Close();
            }

Posted 11-Jul-14 4:07am

Nilton Elvis

Updated 11-Jul-14 4:15am

CHill60

v3

Add a Solution

3 solutions

Solution 3

I would not have noticed, thanks for the help.

Posted 11-Jul-14 4:52am

Nilton Elvis

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)

Abhinav S · Accepted Answer · 2014-07-11T04:15:00

Solution 1

Correct your query -

SQL

cmd.CommandText = "INSERT INTO Itens (Price) " +
"VALUES (@Num)

Remove the single quotes.

As a note, Itens may be the wrong table(Items maybe?).

Posted 11-Jul-14 4:15am

Abhinav S

Updated 11-Jul-14 4:16am

v2

Comments

CHill60 11-Jul-14 10:19am

Overlap! You type quicker than me :)

CHill60 · Accepted Answer · 2014-07-11T04:19:00

The problem is with your sql

SQL

cmd.CommandText = "INSERT INTO Itens (Price) " + "VALUES ('@Num')";

Change it to

SQL

cmd.CommandText = "INSERT INTO Itens (Price) " +
        "VALUES (@Num)";

I removed the single quotes surround the parameter which were forcing the value to be a varchar.

Parameterised queries take care of the single quotes when you add varchar values so you don't need them in your base sql string then either