ASP.NET interview questions: – Explain Method of Sorting GridViewcontrol in ASP.NET?

Sorting: – Sorting allow you to sort the GridViewcontrol data in
Ascending
or Descending order.

Let’s demonstrate a simple example to see how exactly we can sort the GridView Control.

In order to sort the GridView control you need to follow the following steps.

Step1: – Create a new Project > Go to file > New > Project > ASP.NET Empty Web Application.

Now, Add a Web Form in to your application.

Go to Solution explorer > Right click on the project name> Select Add > Add New Item > Select Web Form and click Add.

Step2: -Now on the WebForm1 design modes just drag and drop GridView control from the ToolBox.

In the above diagram of GridView Control you see that the circled column is in black color, now just go to properties of GridView control set  AllowSorting to true and also set AutoGenerateColumns to
false
.

As soon as you set Allowsorting to true will find the GridView
control like below diagram.

In the above diagram you see that now the color of the circle columns is in blue color with underline on it this indicates that you can now sort the GridView control.

Step3: -Go to source of the page and add the following in to it.

<asp:GridView ID="GridView1" runat="server" AllowSorting="True" 
AutoGenerateColumns="False" CellPadding="2" OnSorting="GridView1_Sorting">
<Columns>
<asp:BoundFieldDataField="StudentName" HeaderText="StudentName" 
SortExpression="StudentName" />
<asp:BoundFieldDataField="StudentAdd" HeaderText="StudentAddress" />
</Columns>
</asp:GridView>

In the above code snippet you can see that I have called GridView1_Sorting event on OnSorting property and in the column BoundField just have allow SortExpression on StudentName column.

Step4: -Now go to Webform1.aspx.cs and add the below code snippet.

usingSystem.Data;
usingSystem.Data.SqlClient;
usingSystem.Configuration;

namespaceSortingGridView
{
public partial class WebForm1 : System.Web.UI.Page
{
stringConnectionString = ConfigurationManager.AppSettings["Connect"];
// this is the connectingString you specify your own connection String here.

protected void Page_Load(object sender, EventArgs e)
{
if(!IsPostBack)
{
ViewState["sortOrder"] = "";
LoadGridView("","");
}
}

// LoadGridView is a method to fill data in GridView from sqlserver.

public void LoadGridView(string sortExp,stringsortDir)
{
SqlConnection con = new SqlConnection(ConnectionString);
con.Open();
SqlCommand com = new SqlCommand();
com.CommandText = "select StudentName,StudentAdd from Student";
com.Connection = con;
com.ExecuteNonQuery();
SqlDataAdapteradap = new SqlDataAdapter(com);
DataSet ds = new DataSet();
adap.Fill(ds);
DataView dv = new DataView();
dv = ds.Tables[0].DefaultView; 
if(sortExp != string.Empty)
{
dv.Sort = string.Format("{0} {1}",sortExp,sortDir);
}
GridView1.DataSource = dv;
GridView1.DataBind();
}

public string sortOrder
{ 
get
{ 
if (ViewState["sortOrder"].ToString() == "desc") 
{ 
ViewState["sortOrder"] = "asc"; 
} 
else
{ 
ViewState["sortOrder"] = "desc"; 
} 
returnViewState["sortOrder"].ToString(); 
} 
set
{ 
ViewState["sortOrder"] = value; 
} 
}

protected void GridView1_Sorting(object sender, GridViewSortEventArgs e)
{
LoadGridView(e.SortExpression,sortOrder);
}
}
}

Once you have done with the above steps now run your application and will see output like below diagram.

The result above is displayed according to the data in theSQLServer table, now just click on StudentName and will find result like below diagram.

Now, you can see that GridViewdata has been sorted in Descending order and if you again click on StudentName now the data will be sorted in Ascending order.

Following is the video on ASP.NET Authentication, Authorization, Principal and Identity objects: –


Click and get more stuffs on ASP.NET interview questions

Regards,

Visit for more author’s article on ASP.NET interview questions

Advertisements

About c# and .NET Interview questions

This blog is for developers who want to crack .NET and C# interviews. It has all tips and tricks needed to crack .NET interviews , C# interview , SQL Server interview , Java interview , WCF Interview , Silverlight interview , WPF interview , LINQ interview , Entity framework Interview. Do not forget to watch our Learn step by step video series. Learn MVC in 16 hours:- https://www.youtube.com/watch?v=Lp7nSImO5vk Learn AngularJS Step by Step:- https://www.youtube.com/watch?v=0kmdjqgO9IY Learn Design Pattern in 8 hours:- https://www.youtube.com/watch?v=YDobmucohqk Learn C# and .NET in 60 days:- https://www.youtube.com/watch?v=yh2SrzCkNQA Learn MSBI in 32 hours:- https://www.youtube.com/watch?v=mGPJx3ocFgg Learn SharePoint Step by Step in 8 hours:- https://youtu.be/C2fW76SwJNU
This entry was posted in Uncategorized and tagged , , , , , , , , . Bookmark the permalink.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s