how to bind 2nd combobox based on selected item in first combobox

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I have a requirement of binding two comboboxes----1)i have a table of columns stuid int pk_stuid,stuname varchar(50),address varchar(50)2) and 2nd table is age int FK_stu,class varchar(10),stuid int...now based on the selected item(stuid) in first combobox i have to display the age or class of that student in second combobox...i have succesfull to bind first combobox from backend but i cant to bind the second combobox based on the first... any answers....please suggest me

Posted 8-Jun-14 17:33pm

Naveen Kumar Malli

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Prasad Avunoori · Answer 1 · 2014-06-08T18:21:00

Solution 1

Binding 2nd combobox based on first one's selection[^]

Posted 8-Jun-14 18:21pm

Prasad Avunoori

vJay Yadav · Answer 2 · 2014-06-08T18:59:00

hey navin check out this. may this work for you.

C#

private void FillClass()
    {
        DataSet ds1 = ObjCand.GetddlClass(branchId, yearId);
        if (ds1.Tables[0].Rows.Count > 0)
        {
            GlobalSettings.FillDropDownList(ddlClass, ds1, "classid", "classname", "0", "All Class", "0");
        }
        else
        {
            GlobalSettings.FillDropDownList(ddlClass, ds1, "", "", "0", " All Class ", "0");
        }
        ddlDivision.Items.Insert(0, new ListItem("All Division", "0"));

    }

    private void FillDivision()
    {
        DataSet DS = objAlert.GetDiaryById(Convert.ToInt32(objEncryption.DecodeFrom64(Request.QueryString["cid"])));
        try
        {
            if (DS.Tables[0].Rows.Count > 0)
            {
                int intClassId = Convert.ToInt32(DS.Tables[0].Rows[0]["classid"]);
                DataSet ds1 = objAlert.GetAlertddlDivision(intClassId, yearId);
                if (ds1.Tables[0].Rows.Count > 0)
                {
                    GlobalSettings.FillDropDownList(ddlDivision, ds1, "divisionid", "divisionname", "0", "All Division", "0");
                }
            }
        }
        catch (Exception ex)
        {

        }
    }

protected void ddlClass_SelectedIndexChanged(object sender, EventArgs e)
    {
        try
        {
            DataSet ds1 = objAlert.GetAlertddlDivision(Convert.ToInt32(ddlClass.SelectedValue), yearId);
            if (ds1.Tables[0].Rows.Count > 0)
            {
                GlobalSettings.FillDropDownList(ddlDivision, ds1, "divisionid", "divisionname", "0", "All Division", "0");
                MsgBox.Visible = false;
            }
            else
            {
                ddlDivision.Items.Clear();
                MsgBox.Visible = false;
                ddlDivision.Items.Insert(0, new ListItem("All Division", "0"));

            }

        }
        catch (Exception)
        {

            //  throw;
        }
    }