CODEWITHSUNDEEP
c#asp.netgridview
Saeid Parvizian
Saeid Parvizian

Reputation: 23

Pre-select a value in DropDown list of a GridView in editing mode

How can I set the default value for the dropdown generated by the GridView in editing mode?

This is how I try:
- DropDown items have been added statically (no database)
- I've set a EditItemTemplate and created a Dropdown

I'm wondering how can I set the default value based on the current value of the editing row? Which events should I try and how?

Update:

Following your solution I have encountered this error. Any ideas?

Error Object reference not set to an instance of an object!!!

Error .aspx related controls elements

<asp:TemplateField ShowHeader="False">
    <EditItemTemplate>
        <asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="True" 
            CommandName="Update" Font-Names="B Zar" Font-Size="14pt" ForeColor="#FFFFCC" 
            Text="ثبت"></asp:LinkButton>
        &nbsp;<asp:LinkButton ID="LinkButton2" runat="server" CausesValidation="False" 
            CommandName="Cancel" ForeColor="#FFFFCC" Text="لغو"></asp:LinkButton>
    </EditItemTemplate>
    <ItemTemplate>
        <asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="False" 
            CommandName="Edit" CommandArgument="<%# ((GridViewRow) Container).RowIndex %>" Text="ویرایش"></asp:LinkButton>
    </ItemTemplate>
    <ItemStyle Font-Names="B Zar" Font-Size="14pt" ForeColor="#0066FF" />
</asp:TemplateField>

DropDownList HTML Code:

<asp:DropDownList ID="ddDegree" runat="server" Height="32px" Width="132px" 
Font-Names="B Zar" Font-Size="14pt" >
<asp:ListItem value="0">انتخاب کنید</asp:ListItem>
<asp:ListItem>یک </asp:ListItem>
<asp:ListItem>دو</asp:ListItem>
<asp:ListItem>سه</asp:ListItem>
<asp:ListItem>جهار </asp:ListItem>
<asp:ListItem>پنج </asp:ListItem>
<asp:ListItem>شش</asp:ListItem>
<asp:ListItem>هفت</asp:ListItem>
<asp:ListItem>هشت</asp:ListItem>

Upvotes: 0

Views: 1603

Answers (1)

Ali
Ali

Reputation: 2592

You could use OnRowCommand event on your gridview like this:

<asp:GridView ID="GridView1" OnRowCommand="GridView1_RowCommand" ..
       <Columns>
           <asp:TemplateField>
               <ItemTemplate>
                   <asp:DropDownList ID="DropDownList1" runat="server">
                   </asp:DropDownList>
  ....

lets say you have edit button on your gridview row, then you need to set a command name property on your control like this one:

<asp:Button ID="Button1" runat="server" Text="Button" CommandName="edit" 
               CommandArgument="<%# ((GridViewRow) Container).RowIndex %>" />

And in your event method you just need to set your dropdownlist like this:

    protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
    {
        int index = 0;
        GridViewRow gridRow;

        switch (e.CommandName)
        {
            case "edit":
                index = Convert.ToInt32(e.CommandArgument);
                gridRow = GridView1.Rows[index];

                //get your dropdownlist from the selected gridview row
                DropDownList ddl1 = gridRow.FindControl("DropDownList1") as DropDownList;

                //make the dropdownlist selected based on your given value
                ddl1.Items.FindByValue("set your value here").Selected = true;
                break;
        }
    }

Upvotes: 1

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