How to check if the Serial Number is already been used

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C#

private void CheckSerialNumber()
    {
        
        string strSNExists = "";
        openConnection();
        MySqlCommand cmd = new MySqlCommand();
        cmd.Connection = cn;
        cmd.CommandType = CommandType.Text;
        cmd.CommandText = "select Count(*) from AssetManagement where SerialNumber = @SerialNumber";
        cmd.Parameters.Add("@SerialNumber", MySqlDbType.VarChar).Value = txtSN.Text;
        MySqlDataReader dr = cmd.ExecuteReader();
        while (dr.Read())
        {
            strSNExists = dr.GetChar(strSN).ToString();
        }
        closeConnection();
        dr.Close();

        if (strSNExists == "")
        {
            FileUpload img = (FileUpload)FileUpload1;
            Byte[] imgByte = null;
            if (img.HasFile && img.PostedFile != null)
            {
                HttpPostedFile File = FileUpload1.PostedFile;
                imgByte = new Byte[File.ContentLength];
                File.InputStream.Read(imgByte, 0, File.ContentLength);
            }
            openConnection();
            MySqlCommand cmdReg = new MySqlCommand();
            cmdReg.Connection = cn;
            cmdReg.CommandType = CommandType.Text;
            cmdReg.CommandText = "Insert into AssetManagement (Asset, Component, SerialNumber, Location, UsedBy, ProductPic) values (@Asset, @Component, @SerialNumber, @Location, @UsedBy, @ProductPic)";
            cmdReg.Parameters.Add("@Asset", MySqlDbType.VarChar).Value = txtAsset.Text;
            cmdReg.Parameters.Add("@Component", MySqlDbType.VarChar).Value = txtComponent.Text;
            cmdReg.Parameters.Add("@SerialNumber", MySqlDbType.VarChar).Value = txtSN.Text;
            cmdReg.Parameters.Add("@Location", MySqlDbType.VarChar).Value = txtLocation.Text;
            cmdReg.Parameters.Add("@UsedBy", MySqlDbType.VarChar).Value = txtUsed.Text;
            cmdReg.Parameters.Add("@ProductPic", MySqlDbType.VarBinary).Value = imgByte;
            cmdReg.ExecuteNonQuery();
            closeConnection();
            lblSNExists.Visible = false;
        }
        else
        {
            lblSNExists.Visible = true;
            txtSN.Focus();
        }

Posted 10-Aug-11 19:12pm

thejowker

Updated 10-Aug-11 19:13pm

walterhevedeich

v2

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Comments

walterhevedeich 11-Aug-11 1:14am

I can see that the title may be a question, but I think the code already answered it. :)

Do you have problems with the code? Error?

BobJanova 11-Aug-11 5:56am

What is the question here?

2 solutions

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Mahendra.p25 · Answer 1 · 2011-08-10T19:25:00

Solution 1

try this query

SQL

if exists(select * from AssetManagement where SerialNumber = @SerialNumber)
begin
print 'Exists'
//Your Code
end

else
begin
print 'Not Exists'
// Your Code
end

Posted 10-Aug-11 19:25pm

Mahendra.p25

Comments

thejowker 11-Aug-11 1:28am

where should i put that? please guide me i'm just a newbie

thejowker 11-Aug-11 1:48am

its an error... what code is that?

sujit0761 · Answer 2 · 2011-08-10T22:55:00

Your existing code already checks that logic for existing serial number.

cmd.CommandText = "select Count(*) from AssetManagement where SerialNumber = @SerialNumber";
cmd.Parameters.Add("@SerialNumber", MySqlDbType.VarChar).Value = txtSN.Text;
MySqlDataReader dr = cmd.ExecuteReader();
while (dr.Read())
{
strSNExists = dr.GetChar(strSN).ToString();
}
closeConnection();
dr.Close();

if (strSNExists == "")
{

This part in your code checks the logic