how to create master detail combobox in C# ?

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I Have a excel sheet "test.xlsx" , two sheets within

sheet name :Product1 has following data :

ID ParentID Title
1 0 P1_1
2 0 P1_2

sheet name :Product2 has following data :

ID ParentID Title
1 1 P2_1
2 1 P2_2
3 1 P2_3
4 1 P2_4
5 2 P2_5
6 2 P2_6

calling both sheets in WindowsFormsApplication in asp net ( C# ) as :

C#

 OleDbConnection conn = new OleDbConnection();
            conn.ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=D:\test.xlsx" + @";Extended Properties=""Excel 12.0 Xml;HDR=YES;IMEX=1;ImportMixedTypes=Text;TypeGuessRows=0""";

 /////////////////////////////////////////////////////
           
            OleDbCommand command1 = new OleDbCommand
                    (
              "SELECT ID ,ParentID ,Title " +
            " FROM [Product1$]", conn
                    );
            DataSet ds1 = new DataSet();
             OleDbDataAdapter adaptor1 = new OleDbDataAdapter(command1);
             adaptor1.Fill(ds1);
            Product1.DataSource = ds1.Tables[0];
            Product1.ValueMember = "ID";
            Product1.DisplayMember = "Title";
            
/////////////////////////////////////////////////////

            OleDbCommand command2 = new OleDbCommand
            (
            "SELECT ID	,ParentID ,Title " +
             " FROM [Product2$] " , conn
           );
            DataSet ds2 = new DataSet();
            OleDbDataAdapter adaptor2 = new OleDbDataAdapter(command2);
            adaptor2.Fill(ds2);
            Product2.DataSource = ds2.Tables[0];
            Product2.ValueMember = "ID";
            Product2.DisplayMember = "Title";

i need to know how to create master-detail ( parent - child ) relation in both combobox so that when first combo box value change , 2nd combobox value too reflect changed by ParentID field ..

Posted 27-Apr-15 16:49pm

cookieburner

Updated 27-Apr-15 17:06pm

v2

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Comments

Sascha Lefèvre 28-Apr-15 0:54am

Is it ASP.NET or Windows Forms? You mention both but it can be only one of those ;-)

cookieburner 28-Apr-15 1:06am

windows Forms

2 solutions

Solution 1

Try
Cascading ComboBox In Winforms Windows Forms C# VB.NET[^]
Cascading ComboBox in C-Sharp.Net[^]

Posted 27-Apr-15 17:10pm

Abhinav S

Comments

cookieburner 27-Apr-15 23:35pm

I am new to C# .
links given are not understandable to me .
i not using sql , using oledb connection to import excel data .

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Sascha Lefèvre · Accepted Answer · 2015-04-27T19:39:00

1) Append .DefaultView to these lines:

C#

Product1.DataSource = ds1.Tables[0].DefaultView;

Product2.DataSource = ds2.Tables[0].DefaultView;

2) Double-Click the Product1-ComboBox in the Form-Designer. It will add this to your Form-Class:

C#

private void Product1_SelectedIndexChanged(object sender, EventArgs e)
{

}

3) Add these two lines:

C#

private void Product1_SelectedIndexChanged(object sender, EventArgs e)
{
    if (Product1.ValueMember == "ID")
        ((DataView)Product2.DataSource).RowFilter = "ParentID = " + Product1.SelectedValue;
}

4) Double-Click into a free space on your Form in the Form-Designer. It will add this to your Form-Class:

C#

private void Form1_Load(object sender, EventArgs e)
{

}

(It might be something different than "Form1" for you.)

5) Add this line:

C#

private void Form1_Load(object sender, EventArgs e)
{
    Product1_SelectedIndexChanged(null, null);
}

That should be it.