iam try to get data from databse through comboboxthat time i getting error in "this.dviewmanager=dset.DefaultViewManager; " dviewmanager missing assembly

Question

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C#

private void fnGetConnectedToDatabase()
{
    //Connection string
    string conStr="Provider=Microsoft.Jet.OLEDB.4.0;" +
                  " Data Source=..\\..\\studentDB.mdb";
    try
     {
        //Instantiate OleDbConnection and open
        //the connection to the database
        myConn = new OleDbConnection(conStr);
        myConn.Open();
    }
    catch(OleDbException ex)    {
        //get the error message if connection failed
        MessageBox.Show("Error in connection ..."+ex.Message);
    }
    string sqlStr ="SELECT * FROM studentTable;";
    //Instantiate a DataAdapter by passing the sqlStr and myConn.
    //now data is in raw form
    dAdapter = new OleDbDataAdapter(sqlStr,myConn);
    //Instantiate a DataSet
    dset = new DataSet();
    //Gets a collection that provides the master mapping
    // between a source table and a DataTable
    dAdapter.TableMappings.Add("Table", "studentTable");
    //A data adapter object utilizes the Fill method
    //to populate a DataSet or a DataTable object with
    //data retrieved by a SELECT command.
    dAdapter.Fill(dset);
    //When binding a DataSet, .NET automatically uses the corresponding
    //DataViewManager provided through the DataSet.DefaultViewManager property
    this.dviewmanager=dset.DefaultViewManager;
    this.comboBox1.DataSource=this.dviewmanager;
    //display "studentTable.StudentID" in the ComboBox
    this.comboBox1.DisplayMember="studentTable.StudentID";
    //DataBinding for the TextBox controls
    this.textBox1.DataBindings.Add("Text",
              this.dviewmanager,"studentTable.StudentID");
    this.textBox2.DataBindings.Add("Text",
              this.dviewmanager, "studentTable.StudentSubject");
    this.textBox3.DataBindings.Add("Text",
              this.dviewmanager, "studentTable.StudentName");
    // Close the connection to the database.
    this.myConn.Close();
}

Posted 12-Jun-12 22:49pm

Master Vinu

Updated 12-Jun-12 22:57pm

v2

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Master Vinu 13-Jun-12 5:12am

could you please change in code i cant understand

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**tanweer** · Answer 1 · 2012-06-12T23:26:00

hi, I had modified your function:

C#

//Connection string
          string conStr = "Provider=Microsoft.Jet.OLEDB.4.0;" +
                        " Data Source=..\\..\\studentDB.mdb";
      private void fnGetConnectedToDatabase()
       {
          try
          {
              //Instantiate OleDbConnection and open
              //the connection to the database
              myConn = new OleDbConnection(conStr);
              myConn.Open();
          }
          catch (OleDbException ex)
          {
              //get the error message if connection failed
              MessageBox.Show("Error in connection ..." + ex.Message);
          }
          string sqlStr = "SELECT * FROM studentTable;";
          //Instantiate a DataAdapter by passing the sqlStr and myConn.
          dAdapter = new OleDbDataAdapter(sqlStr, myConn);
          //Instantiate a DataSet
          dset = new DataSet();
          //fill the dataset
          dAdapter.Fill(dset);
          //set the data source
          this.comboBox1.DataSource = ds;
          //display "studentTable.StudentID" in the ComboBox
          this.comboBox1.DisplayMember = "StudentID";

          this.myConn.Close();
      }

[edited] to load related values in Textboxes

C#

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
       {
         try
           {
               //Instantiate OleDbConnection and open
               //the connection to the database
               myConn = new OleDbConnection(conStr);
               myConn.Open();
           }
           catch (OleDbException ex)
           {
               //get the error message if connection failed
               MessageBox.Show("Error in connection ..." + ex.Message);
           }
           string sqlStr = "SELECT * FROM studentTable wehre StudentID="+comboBox1.SelectedValue.ToString()+";";
           //Instantiate a DataAdapter by passing the sqlStr and myConn.
           dAdapter = new OleDbDataAdapter(sqlStr, myConn);
           //Instantiate a DataSet
           dset = new DataSet();
           //fill the dataset
           dAdapter.Fill(dset);
           //DataBinding for the TextBox controls
           this.textBox1.Text=ds.Table[0].Rows[0]["StudentID"].ToString();
           this.textBox2.Text = ds.Table[0].Rows[0]["StudentSubject"].ToString();
           this.textBox3.Text = ds.Table[0].Rows[0]["StudentName"].ToString();
       }

hope this help you.

Master Vinu · Answer 2 · 2012-06-14T22:23:00

form1_load { SqlDataAdapter ad=new SqlDataAdapter("select *from reg",con); DataSet ds=new DataSet(); ad.Fill(ds,"reg"); comboBox1.DataSource=ds.Tables["reg"].DefaultView; comboBox1.DisplayMember="name"; comboBox1.ValueMember="name"; } private void comboBox1_SelectedIndexChanged() { SqlDataAdapter addd=new sqldataadapter("select *from reg where name='"+comboBox1.SelectedValue.ToString()+"'",con); DataSet dss=new DataSet(); ad.fill(dss,"reg"); if(dss.Tables["reg"].Rows.Count>0) { textBox1.Text=dss.Tables["reg"].Rows[0]["telno"].ToString(); } else { textBox1.Text=""; } } it is working finely try it.

iam try to get data from databse through comboboxthat time i getting error in "this.dviewmanager=dset.DefaultViewManager; " dviewmanager missing assembly

2 solutions

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