how to get controls from list view?

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i have a listview and two columns Country and state (both are combo box).i want to filter state combo box with country combo box .i didnt get object of combo State in comboCountry_SelectionChanged Event. help me

Posted 3-Dec-15 19:13pm

Mahesh Alappuzha

Updated 3-Dec-15 23:14pm

v3

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Anisuzzaman Sumon 4-Dec-15 2:36am

Please Show some code

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 4-Dec-15 4:32am

Where is the issue?

Mahesh Alappuzha 4-Dec-15 5:08am

i didnt get object of combo State in comboCountry_SelectionChanged Event.

2 solutions

Solution 1

This is probably easiest done by creating a DataSet with two DataTable, Countries and States, with a relation in between.

Then you use two BindingSource, one for Countries and one for States, that you use as DataSource for your combo boxes.

The code below is written for a Windows Form with two regular ComboBox controls, but the principal is the same for your case.
Only the last part of the code where the combo boxes are assigned the data sources should differ.

C#

DataSet dsData = new DataSet("CountriesAndStates");

DataTable dtCountries = dsData.Tables.Add("Countries");
DataColumn dcPK = dtCountries.Columns.Add("CountryID", typeof(int));
dtCountries.Columns.Add("Name", typeof(string));

dcPK.AutoIncrement = true;
dtCountries.PrimaryKey = new DataColumn[] { dcPK };

DataTable dtStates = dsData.Tables.Add("States");
dtStates.Columns.Add("Name", typeof(string));
DataColumn dcFK = dtStates.Columns.Add("CountryID", typeof(int));

dsData.Relations.Add("Country_State", dcPK, dcFK);

DataRow drParent = null;

drParent = dtCountries.NewRow();
drParent["Name"] = "USA";
dtCountries.Rows.Add(drParent);

dtStates.Rows.Add("Alabama", drParent["CountryID"]);
dtStates.Rows.Add("Alaska", drParent["CountryID"]);
dtStates.Rows.Add("Utah", drParent["CountryID"]);

drParent = dtCountries.NewRow();
drParent["Name"] = "Canada";
dtCountries.Rows.Add(drParent);

dtStates.Rows.Add("Alberta", drParent["CountryID"]);
dtStates.Rows.Add("British Columbia", drParent["CountryID"]);
dtStates.Rows.Add("Quebec", drParent["CountryID"]);

BindingSource bsCountries = new BindingSource(dsData, "Countries");
BindingSource bsStates = new BindingSource(bsCountries, "Country_State");

cbCountries.DataSource = bsCountries;
cbCountries.DisplayMember = "Name";

cbStates.DataSource = bsStates;
cbStates.DisplayMember = "Name";

I tried to do an implementation of this in WPF as well, but being a total newbie to this technology I found it a bit difficult.
In other words, I failed miserably. :-(
And no more time today.

Posted 3-Dec-15 22:25pm

George Jonsson

Updated 4-Dec-15 0:19am

v3

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Mahesh Alappuzha · Accepted Answer · 2015-12-08T21:17:00

C#

private System.Windows.DependencyObject FindChildControl<T> ( System.Windows.DependencyObject control , string ctrlName , long lRowid )
      {
          int childNumber = System.Windows.Media.VisualTreeHelper.GetChildrenCount ( control );
          for ( int i = 0 ; i < childNumber ; i++ )
          {
              System.Windows.DependencyObject child = System.Windows.Media.VisualTreeHelper.GetChild ( control , i );
              System.Windows.FrameworkElement fe = child as System.Windows.FrameworkElement;
              // Not a framework element or is null
              if ( fe == null ) return null;

              if ( child is T && fe.Name == ctrlName && fe.Tag.ToString ( ) == lRowid.ToString ( ) )
              {
                  // Found the control so return
                  return child;
              }
              else
              {
                  // Not found it - search children
                  System.Windows.DependencyObject nextLevel = FindChildControl<T> ( child , ctrlName , lRowid );
                  if ( nextLevel != null )
                      return nextLevel;
              }
          }
          return null;
      }