how to handle combobox selectedindexchanged dynamically in c#

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i have one combobox with flowers,fruits,vegetables
when i select combobox1 in combobox2 it has to display types of fruits(apple,mango,orange)..all this has to be done dynamically means getting the values from sql server

I worked with this code it's not working...it's showing error at
MaskId = Convert.ToInt32(cmbmoduleid.Text);
----------------------------------------------------------------------

C#

private void cmbmoduleid_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (cmbmoduleid.SelectedIndex > -1 && cmbmoduleid.SelectedItem != null)
            {
        
                if (cmbmoduleid.SelectedText.ToString() != "")
                {
                   MaskId = Convert.ToInt32(cmbmoduleid.Text);
                    DatasetForm = glbObj.srv.ViewDataSRV(clsGetViewXmlData.GetViewXMLData(gInfo.SchemaName, GlobalSP.FormInsert.Usp_FormInsert_SelectSubModule.ToString(), MaskId));
                    DataTable Dt = DatasetForm.Tables[0];

                    //cmbmoduleid.DataSource = new BindingSource(ImpecApplication.Cust.Reports.Global.GLB_FORMS, null);
                    cmbsubmoduleid.DataSource = Dt;
                    cmbsubmoduleid.DisplayMember = "SubModule_Name"; //colum you want to show in comboBox
                    cmbsubmoduleid.ValueMember = "SubModule_ID";
                }
            }

        }

Posted 25-Jun-12 1:00am

Member 9068558

Updated 25-Jun-12 1:03am

Ganesan Senthilvel

v2

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Ganesan Senthilvel 25-Jun-12 7:03am

Code format

[no name] 25-Jun-12 7:34am

You would be better off using TryParse to convert strings to numeric values.

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DamithSL · Answer 1 · 2012-06-25T01:24:00

C#

public Form1()
{
    InitializeComponent();
    List<KeyValuePair<string, int>> list = new List<KeyValuePair<string, int>>();
    list.Add(new KeyValuePair<string, int>("apple", 1));
    list.Add(new KeyValuePair<string, int>("mango", 2));
    list.Add(new KeyValuePair<string, int>("orange", 3));
    comboBox1.DisplayMember = "Key";
    comboBox1.ValueMember = "Value";
    comboBox1.DataSource = list;

}

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
    int selectedValue = (int)comboBox1.SelectedValue;

}

Or you can use your custom class to bind as combobox data source

C#

public class ComboItem
{
    public string stringValue { get; set; }
    public int indexValue { get; set; }
}

public void LoadCombo()
{
     List<ComboItem> list = new List<ComboItem>();
     // populate list...
     // then bind list
     myComboBox.DisplayMember = "stringValue";
     myComboBox.ValueMember = "indexValue";
     myComboBox.DataSource = list;
}
Then

myComboBox.SelectedText       // will return stringValue
myComboBox.SelectedValue      // will return indexValue
myComboBox.SelectedItem       // will return the ComboItem itself
myComboBox.SelectedIndex      // will return the items index in the list

http://stackoverflow.com/questions/4691731/winforms-c-adding-items-to-combox-and-controlling-the-item-value-numeric[^]