Set Values for other columns in gridview based on selected value of dropdownlist inside gridview(edit mode) in ASP.Net

I have gridview with Employee Name, Emp Code, Designation. I am populating Employee Names dropdownlist with values in rowdatabound event. In edit mode of, on selection of a value in Employee Names dropdownlist, the EmpCode and Designation should change accordingly. The empCode and Designation label controls are in templatefield. I have writtern selectionchanged event for the Employee Names drodownlist,

ddlEmp.SelectedIndexChanged += new EventHandler(grd_ddlEmp_SelectedIndexChanged);

but I do not know how to change Emp Code and Designation va开发者_开发知识库lues inside the particular row in gridview.

Does these things inside the SelectedIndexChanged event of the DropDownList

1. First find the row.
2. Then access the controls and change accordingly.

Pseudo Code

protected void grd_ddlEmp_SelectedIndexChanged(object sender, EventArgs e)
{
    GridView row = ((DropDownList)sender).NamingContainer as GridViewRow;
    Label Designation = row.FindControl("id of the designation label") as Label;
    Designation.Text = "new Designation Name";
}

In the SelectedIndexChanged function, find the selected value of the drop down box

  DropDownList ddl = (GridView1.Rows[GridView1.SelectedIndex].FindControl("DropDownList1") AS DropDownList);
  var selectedVal = ddl.SelectedValue;

Execute some code to determine the Emp Code and Desgination and then populate the relevant label ( or other control):

Label lbl = GridView1.Rows[GridView1.SelectedIndex].FindControl("Label1") as Label;

Assign value to the label.

You need to put your gridview in UpdatePanel and do it in code behind of SelectedIndexChanged event like I have done in datalist below :

<asp:DataList ID="dlstPassengers" runat="server" OnItemDataBound="dlstPassengers_ItemDataBound"
 RepeatDirection="Horizontal" RepeatColumns="2" Width="100%">
 <ItemTemplate>
       <div class="form-linebg" style="line-height: 32px;">
            <asp:DropDownList ID="ddlCountry" AutoPostBack="true"  OnSelectedIndexChanged="ddlCountry_SelectedIndexChanged"
CssClass="select-3" Style="width: 145px; margin-bottom: 9px;" runat="server">
</asp:DropDownList>
<br />
<asp:DropDownList ID="ddlCity" CssClass="select-3" Style="width: 145px; margin-bottom: 10px;"
runat="server">
</asp:DropDownList>
</div>
</ItemTemplate>
</asp:DataList>

In code behind :

protected void ddlCountry_SelectedIndexChanged(object sender, EventArgs e)
            {
                DropDownList ddlCountry = (DropDownList)sender;
                DropDownList ddlCity = (DropDownList)((DropDownList)sender).Parent.FindControl("ddlCity");
                BindCity(ddlCity, ddlCountry.SelectedValue);
            }

    private void BindCity(DropDownList ddlCity, string countryCode)
            {
    // Binding code of city based selected country
    }

You need to set EmpCode and Designation columns on SelectedIndexChanged event of dropdown by finding control in code behind.

use in your dropdown AutoPostBack="true"