Combobox Selected Index changed

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How to retrieve data from database tables to Crystal Report Viewer. through combobox selected item.

C#

public partial class Form1 : Form
    {
        SqlConnection con = new SqlConnection("Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=CMS;Data Source=KOUSHIK");
        SqlDataAdapter da;
        SqlCommand cmd;
        DateTime dt = System.DateTime.Now;
        public Form1()
        {
            InitializeComponent();
        }

        private void btnGenerate_Click(object sender, EventArgs e)
        {
                cmd = new SqlCommand();
                da = new SqlDataAdapter();
                cmd.CommandText = "select Accessory_No,Book_Title,Book_Price,Book_Author,Book_Publisher,Date_of_Purchase,Available,Issued,Remaining from BookDetails1";
                da.SelectCommand = cmd;
                cmd.Connection = con;
                da.SelectCommand = cmd;
                DataSet ds = new DataSet();
                da.Fill(ds);
                ReportDocument rptc = new ReportDocument();
                rptc.Load("D:\\CMS\\BookDetailReport\\BookDetailReport\\BookDetailedReport2.rpt");
                rptc.SetDataSource(ds);
                crystalReportViewer1.ReportSource = rptc;
        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {

        }

Posted 26-Sep-11 2:15am

Koushik Uppari

Updated 26-Sep-11 2:17am

Ankur^\m/

v2

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3 solutions

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Syed Salman Raza Zaidi · Answer 1 · 2011-09-26T02:21:00

Solution 1

Try this query

cmd.CommandText = "select Accessory_No,Book_Title,Book_Price,Book_Author,Book_Publisher,Date_of_Purchase,Available,Issued,Remaining from BookDetails1 where Column='"+comboBox1.selectedValue.toString()+"'";

Posted 26-Sep-11 2:21am

Syed Salman Raza Zaidi

Comments

Mehdi Gholam 26-Sep-11 8:23am

My 5! but Column must be specified and ToString() can be omitted.

P.Salini 26-Sep-11 8:30am

My 5!

kris444 26-Sep-11 8:48am

what if selectedValue is object? You can simply says comboBox1.SelectedText right?

Koushik Uppari · Answer 2 · 2011-09-26T02:46:00

Solution 2

Thank u for u r reply.
and after trail
Object reference not set to an instance of an object.

I got this error again.

Posted 26-Sep-11 2:46am

Koushik Uppari

Comments

Syed Salman Raza Zaidi 26-Sep-11 9:10am

Try this con.Open()

Bala Selvanayagam · Answer 3 · 2011-09-26T03:55:00

The reason could be there is no value selected in the combo box at the time you execute the query, add the following before the cmd.CommandText and see whether it helps

C#

if (comboBox1.SelectedValue==null)
             {
                 MessageBox.Show("Please select a value");
                 comboBox1.Focus();
                 return;
             }