How To Create SelectedIndexChange Event for DropDownList

Question

Hi, I am dynamically adding the row to the gridview which contains the dropdownlist and Label controls, I want to add the selected index change event of the dropdownlist. Please suggest me solution for that.

Ramesh Maruthi · Answer

http://myaspsnippets.blogspot.com/2012/10/gridview-dropdownlist-selected-index.html http://asimsajjad.blogspot.com/2009/09/raising-dropdownlist.html http://forums.asp.net/t/1410616.aspx?+SelectedIndexChanged+event+of+a+DropDownList+in+gridview+EditItemTemplate http://p2p.wrox.com/asp-net-2-0-professional/75742-dropdownlist-selectedindexchanged-gridview.html

Santosh Kumar · Answer

Hi Ankur Thanks for the reply i have done the same way but my selectedindex change is not firing, My scenarioa is, my grid contains the itemtemplate with some labels which will diplays the search result(I have some text boxes and a Search Button, need to enter the search criteria and click search button), And I am adding the a next row (after the last row) dynamically with dropdownlist and some labels and i want to create a selected index change event for the dynamically created drop down list. protected void grdProjectEmpDetails_RowDataBound(object sender, GridViewRowEventArgs e) { try { EmployeeBillingBO generic = (EmployeeBillingBO) e.Row.DataItem; // Created new Row if (btnAddNewResource.UniqueID == this.GetPostBackControlID()) { EmployeeBillingService gs = new EmployeeBillingService(this.ContextBO); // List gList = var list = gs.GetEmployeeProjectDetails(28, 25855, sonStartDate1.Date, sonEndDate1.Date); if (DataControlRowType.DataRow == e.Row.RowType && e.Row.RowState != DataControlRowState.Edit && (e.Row.RowState == DataControlRowState.Normal || e.Row.RowState == DataControlRowState.Alternate)) { Label lblOrbitProjectID = new Label(); lblOrbitProjectID.ID = "lblOrbitProjectIDIns"; lblOrbitProjectID.Attributes.Add("runat", "server"); Label lblEmployeeNameIns = new Label(); lblEmployeeNameIns.ID = "lblEmployeeNameIns"; lblEmployeeNameIns.Attributes.Add("runat", "server"); Label lblPoNumberIns = new Label(); //here i m adding a control. lblPoNumberIns.ID = "lblPoNumberIns"; lblPoNumberIns.Attributes.Add("runat", "server"); DropDownList ddlEmployeeCode = new DropDownList(); ddlEmployeeCode.ID = "ddlEmployeeCode"; ddlEmployeeCode.Attributes.Add("runat", "server"); ddlEmployeeCode.AutoPostBack = true; DropDownList ddlEmployeeRole = new DropDownList(); ddlEmployeeRole.ID = "ddlEmployeeRole"; ddlEmployeeRole.Attributes.Add("runat", "server"); int y = grdProjectEmpDetails.Rows.Count - list.Count; for (int i = 0; i { e.Row.Cells[0].Controls.Add(lblOrbitProjectID); e.Row.Cells[1].Controls.Add(ddlEmployeeCode); e.Row.Cells[2].Controls.Add(lblEmployeeNameIns); e.Row.Cells[3].Controls.Add(ddlEmployeeRole); //textbox is added as last column of grid EmployeeService employeeService = new EmployeeService(this.ContextBO); List employeeList = new List (); lblOrbitProjectID.Text = "25855"; lblPoNumberIns.Text = "PO12345"; // ddlEmployeeCode.Attributes.Add("onClick", "EmployeeName();"); ddlEmployeeCode.AppendDataBoundItems = true; employeeList = employeeService.GetEmployeeList(); ddlEmployeeCode.DataSource = employeeList; // ddlEmployeeCode.AutoPostBack = true; ddlEmployeeCode.SelectedIndexChanged += new System.EventHandler(this.ddlEmployeeCode_SelectedIndexChanged); //ddlEmployeeCode.SelectedIndexChanged +=ddlEmployeeCode_SelectedIndexChanged; ddlEmployeeCode.DataTextField = "EmployeeOrbitCode"; ddlEmployeeCode.DataValueField = "EmployeeOrbitCode"; ddlEmployeeCode.DataBind(); LookupService lookUpService = new LookupService(this.ContextBO); List empRoleList = new List (); ddlEmployeeRole.AppendDataBoundItems = true; empRoleList = lookUpService.GetLookUpValuesByLookupTypeID((int) LookupTableType.EmployeeRole); ddlEmployeeRole.DataSource = empRoleList; ddlEmployeeRole.DataTextField = ddlEmployeeRole.DataValueField = "LookupDescription"; ddlEmployeeRole.DataBind(); } } } } } void ddlEmployeeCode_SelectedIndexChanged(object sender, EventArgs e) { DropDownList ddlEmployeeCode = (DropDownList) sender; EmployeeService employeeService = new EmployeeService(this.ContextBO); List employeeList = new List (); foreach(GridViewRow row in grdProjectEmpDetails.Rows) { Label lblEmpname = (Label) row.FindControl("lblEmployeeNameIns") as Label; lblEmpname.Text = Convert.ToString(employeeService.GetEmployeeNameByEmpCode(Convert.ToInt32(ddlEmployeeCode.SelectedItem.Text))); } }

Ankur Jain · Answer

Hi! Try like this... ddl . SelectedIndexChanged += new System . EventHandler ( ddl_SelectedValueChanged ); private void ddl_SelectedValueChanged ( object sender , EventArgs e ) { //Do something here. }