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.

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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";
}

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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.

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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.

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use in your dropdown AutoPostBack="true"