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02.21.2008 at 01:12PM PST, ID: 23182652
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DropDownList pre-selection on GridView Edit

Asked by SeTech in Programming for ASP.NET, C# Programming Language, Visual Studio .NET 2005

Tags: C#

I have a GridView in which one column normally contains a Label. To insert a new row into the Gridview (well, technically, the database the GridView displays data from), the value for that column is chosen from a DropDownList bound to an XML file (at runtime in the C# code-behind).

On a user clicking the "Edit" command, the Edit template for that column is another DropDownList to ensure that the input data is valid. However, I need that DropDownList to be pre-selected with the value that already exists in the label. But obviously, my methodology is incorrect, and I'm quite frankly lost on this. I'm getting an error message of "Object reference not set to an instance of an object". I'll post the method below.

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protected void gvResult_RowEditing(object sender, GridViewEditEventArgs e)
    {
        ds = new DataSet();
        ServerPath = Server.MapPath(@"\");
        ds.ReadXml(ServerPath + @"\Library\xml\claimdir\Office.xml");
        DropDownList ddl = (DropDownList)(gvResult.Rows[e.NewEditIndex].FindControl("ddlOfficeUpdate"));
        ddl.DataTextField = "Text";
        ddl.DataValueField = "Value";
        ddl.DataSource = ds.Tables[0];
        ddl.DataBind();
        ddl.SelectedIndex = ddl.Items.IndexOf(ddl.Items.FindByValue(((Label)(gvResult.Rows[e.NewEditIndex].FindControl("lblOffice"))).Text));
    }
[+][-]02.21.2008 at 01:37PM PST, ID: 20952114

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[+][-]02.21.2008 at 09:34PM PST, ID: 20954919

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[+][-]02.22.2008 at 08:41PM PST, ID: 20963698

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[+][-]02.25.2008 at 12:55PM PST, ID: 20979133

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[+][-]02.25.2008 at 09:47PM PST, ID: 20981906

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[+][-]02.26.2008 at 05:17AM PST, ID: 20983932

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[+][-]02.27.2008 at 10:26PM PST, ID: 21001600

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[+][-]02.29.2008 at 08:48PM PST, ID: 21020006

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Zones: Programming for ASP.NET, C# Programming Language, Visual Studio .NET 2005
Tags: C#
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Solution Provided By: digitalZo
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Solution Grade: B
 
 
[+][-]03.10.2008 at 07:24AM PDT, ID: 21086593

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