how to handle combobox selectedindexchanged dynamically in c#

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my requirement is ...if i select spme value in combobox1 the related values of combobox1 have to display in cmbbox2
i tried with this code its not working

for cmbbox1

C#

private void fillModule()
      {
          DatasetForm = glbObj.srv.ViewDataSRV(clsGetViewXmlData.GetViewXMLData(gInfo.SchemaName, GlobalSP.FormInsert.Usp_FormInsert_SelectModule.ToString(), glbObj.inputMasKey));
          DataTable Dt = DatasetForm.Tables[0];
          if (Dt.Rows.Count > 0)
          {

              cmbmoduleid.DataSource = Dt;
              cmbmoduleid.DisplayMember = "Module_Name"; //colum you want to show in comboBox
              cmbmoduleid.ValueMember = "Module_Id";
          }
      }

for cmb2 i've written this code

C#

private void cmbmoduleid_SelectedIndexChanged(object sender, EventArgs e)
{

    if (cmbmoduleid.SelectedIndex > -1 && cmbmoduleid.Text == "")
    {

        //DataRow selectedDataRow = ((DataRowView)cmbmoduleid.SelectedItem).Row;
        if (cmbmoduleid.SelectedText != "")
        {
            MaskId = Convert.ToInt32(cmbmoduleid.SelectedText);
            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 20:36pm

Member 9068558

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Sebastian T Xavier 26-Jun-12 2:39am

do spell check

3 solutions

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Sebastian T Xavier · Answer 1 · 2012-06-25T20:41:00

Will this condition ever come true?

SQL

if (cmbmoduleid.SelectedIndex > -1 && cmbmoduleid.Text == "")
    {.....}

I think the problem is here.

Please make sure the below code will not throw type cast exception

C#

MaskId = Convert.ToInt32(cmbmoduleid.SelectedText);

NB: Why should we use dataset if it contains only one datatable. Use datatable instead. That will boost performance.

Regards
Sebastian

DamithSL · Answer 2 · 2012-06-25T20:43:00

you need to get SelectedValue not SelectedText

C#

MaskId = Convert.ToInt32(cmbmoduleid.SelectedValue);

and also you better use int.TryParse

C#

private void cmbmoduleid_SelectedIndexChanged(object sender, EventArgs e)
{
 
   var mskId;

   if(int.TryParse(cmbmoduleid.SelectedValue, out mskId))
   {
      DatasetForm = glbObj.srv.ViewDataSRV(clsGetViewXmlData.GetViewXMLData(gInfo.SchemaName,    GlobalSP.FormInsert.Usp_FormInsert_SelectSubModule.ToString(), mskId));
     // rest of the code
   }
}

Manoj Kumar Choubey · Answer 3 · 2012-06-25T21:00:00

Solution 3

Putt following conditon ....

SQL

if (cmbmoduleid.SelectedIndex > -1 )
    {.....}

following condition is wrong ....

SQL

if (cmbmoduleid.SelectedIndex > -1 && cmbmoduleid.Text == "")
    {

Posted 25-Jun-12 21:00pm

Manoj Kumar Choubey

how to handle combobox selectedindexchanged dynamically in c#

3 solutions

Solution 1

Solution 2

Solution 3

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