search button for window application C#

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Hello! i create a search button for search database from ms SQL server.

C#

SqlConnection con = new SqlConnection("Data Source=.\\SQLEXPRESS;AttachDbFilename=C:\\Documents and Settings\\meekun.poon\\My Documents\\Visual Studio 2008\\Projects\\TrackLocation\\TrackLocation\\barcodePrinter.mdf;Integrated Security=True;User Instance=True");
              DataTable dt = new DataTable();
                             SqlDataAdapter SDA = new SqlDataAdapter("SELECT SerialNo,IT_Tag,PrinterID,Product,Model,Department,Location FROM [BarCodePrinter]WHERE BarCodePrinter.SerialNo= ''" +( textBox1.Text), con);
                  SDA.Fill(dt);
                  SDA.ToString();
                  dataGridView1.DataSource = dt;

**above is part of code...
But when click the search button, there are not data display.
Can someone one tell me the problem and solution?

thanks

Posted 14-Nov-12 20:32pm

WinnieMeeKun

Updated 14-Nov-12 20:36pm

André Kraak

v2

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OriginalGriff · Answer 1 · 2012-11-14T21:11:00

Because you got the SELECT statement wrong: the quotes are in the wrong place:

C#

SqlDataAdapter SDA = new SqlDataAdapter("SELECT SerialNo,IT_Tag,PrinterID,Product,Model,Department,Location FROM [BarCodePrinter]WHERE BarCodePrinter.SerialNo= ''" +( textBox1.Text), con);

Becomes

C#

SqlDataAdapter SDA = new SqlDataAdapter("SELECT SerialNo,IT_Tag,PrinterID,Product,Model,Department,Location FROM [BarCodePrinter]WHERE BarCodePrinter.SerialNo= '" + textBox1.Text + "'", con);

But don't do it like that! Do not concatenate strings to build a SQL command. It leaves you wide open to accidental or deliberate SQL Injection attack which can destroy your entire database. Use Parametrized queries instead.

C#

SqlDataAdapter SDA = new SqlDataAdapter("SELECT SerialNo,IT_Tag,PrinterID,Product,Model,Department,Location FROM [BarCodePrinter]WHERE BarCodePrinter.SerialNo=@SN", con);
SDA.SelectCommand.Parameters.AddWithValue("@SN", textBox1.Text);

WinnieMeeKun · Answer 2 · 2012-11-14T21:25:00

Solution 2

Thanks....the datagridview can display data based on the textBox...

Posted 14-Nov-12 21:25pm