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C# update

Posted on 2014-04-11
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Last Modified: 2014-04-14
Hi guys ,

I'm trying to update just one column and I got error see screenshot (app) and also see attachment of my table.

here is my code:

string Query = "update rmsmasterdbtest.dbo.serial set serialnumber='" + this.txtsn.Text + "' ,serialnumber3='" + this.txtstatus + "' where serialnumber='" + this.txtsn.Text + "' ;";

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database.JPG
app.JPG
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Question by:Moti Mashiah
  • 4
5 Comments
 
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Accepted Solution

by:
Carl Tawn earned 500 total points
ID: 39994409
I suspect this:
this.txtstatus

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Should say:
this.txtstatus.Text

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Otherwise it will spit out the object type information, which will exceed the 10 characters that your field will accept.
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LVL 1

Author Comment

by:Moti Mashiah
ID: 39994456
that's is right carl thank you very much and also I just figured that I forgot to add the Reader in my code now all work fine:

Carl , it seems that any time I'm trying to update I got some issue I think that I'm not really understand the concept updating database columns can you give my some explanation also I would like to now what is the difference between these two update methods

1.
string Query = "update RMSCRM.dbo.sales set Status=@Status, note=@note where ID=@id";
            
           

            SqlConnection Myconn = new SqlConnection(conn);
            SqlCommand cmd = new SqlCommand(Query, Myconn);

            int SalesID = int.Parse(this.txtid.Text);

            cmd.Parameters.AddWithValue("@id", SalesID);
            cmd.Parameters.AddWithValue("@status", this.txtStatus.Text);
            cmd.Parameters.AddWithValue("@note", this.txtNote.Text);

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2.
string Query = "update rmsmasterdbtest.dbo.serial set serialnumber='" + this.txtsn.Text + "' ,serialnumber3='" + this.txtstatus.Text + "' where serialnumber='" + this.txtsn.Text + "' ;";

           
            SqlConnection Myconn = new SqlConnection(conn);
            SqlCommand cmd = new SqlCommand(Query, Myconn);
            SqlDataReader Reader;
           

            try
            {
                Myconn.Open();
                Reader = cmd.ExecuteReader();
                MessageBox.Show("Updated Status");
                while (Reader.Read())
                {

                }

Thank you soo much
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LVL 1

Author Comment

by:Moti Mashiah
ID: 39994534
I read some material but still get complicated when I'm trying to write update code.
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Author Comment

by:Moti Mashiah
ID: 39999819
I've requested that this question be closed as follows:

Accepted answer: 0 points for motimash's comment #a39994534
Assisted answer: 500 points for carl_tawn's comment #a39994409

for the following reason:

Thanks
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LVL 1

Author Closing Comment

by:Moti Mashiah
ID: 39999820
Excellent as usual
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