C# – gridview paging using dataset

asp.netcdatasetgridviewpagination

I have an ASP.NET web app (C#) where I get some information from a datasource and display it in the the gridview. I wanted to enable paging, but for some reason, paging doesn't work. I researched a little online, and I found that paging is done differently if a dataset is used. When I click on a page number, it refreshes, and says that there are no records to display. I call this function in the click function of a button:

        bindGrid(cmd);

Here's my bind method:

    private void bindGrid(OracleCommand comm)
    {
        OracleDataAdapter adapter = new OracleDataAdapter(comm);
        DataSet ds = new DataSet();

        ds.Tables.Add("Results");
        adapter.Fill(ds.Tables["Results"]);

        grd.DataSource = ds;
        grd.DataBind();
    }

Paging Method:

    protected void grdResults_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
        grd.PageIndex = e.NewPageIndex;
        grd.DataBind();
    }

How am I supposed to do paging with a dataset? Can someone help please?

Best Answer

You also need to fetch the data :)

So instead of this:

protected void grdResults_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
    grd.PageIndex = e.NewPageIndex;
    grd.DataBind();
}

you should use:

protected void grdResults_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
    grd.PageIndex = e.NewPageIndex;

    //Create command
    bindGrid(comm);

}

Related Solutions

C# – Should ‘using’ directives be inside or outside the namespace

There is actually a (subtle) difference between the two. Imagine you have the following code in File1.cs:

// File1.cs
using System;
namespace Outer.Inner
{
    class Foo
    {
        static void Bar()
        {
            double d = Math.PI;
        }
    }
}

Now imagine that someone adds another file (File2.cs) to the project that looks like this:

// File2.cs
namespace Outer
{
    class Math
    {
    }
}

The compiler searches Outer before looking at those using directives outside the namespace, so it finds Outer.Math instead of System.Math. Unfortunately (or perhaps fortunately?), Outer.Math has no PI member, so File1 is now broken.

This changes if you put the using inside your namespace declaration, as follows:

// File1b.cs
namespace Outer.Inner
{
    using System;
    class Foo
    {
        static void Bar()
        {
            double d = Math.PI;
        }
    }
}

Now the compiler searches System before searching Outer, finds System.Math, and all is well.

Some would argue that Math might be a bad name for a user-defined class, since there's already one in System; the point here is just that there is a difference, and it affects the maintainability of your code.

It's also interesting to note what happens if Foo is in namespace Outer, rather than Outer.Inner. In that case, adding Outer.Math in File2 breaks File1 regardless of where the using goes. This implies that the compiler searches the innermost enclosing namespace before it looks at any using directive.

Best Answer

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C# – Should ‘using’ directives be inside or outside the namespace

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