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ASP.NET GridView All-In-One Quick Reference

By admin | July 17, 2010

Here is a quick collection of snippets where one can quickly lookup the necessities of setting up a GridView for the purposes of displaying information to the viewer through a database (for example, MySQL):

Adding Columns of Data

DataTable dt = new DataTable("Tablename");
dt.Columns.Add("Column1");
dt.Columns.Add("Column2");
dt.Columns.Add("Column3");
// for every row
DataRow dr = dt.NewRow();
dr["Column1"] = "Testing";
dr["Column2"] = "Blah";
dr["Column3"] = "Big Blah";
dt.Rows.Add(dr);

Binding the Data (and storage across sessions)

DataView dv = new DataView(dt);
Session["data"] = dv;
gridviewctrl.DataSource = dv;
gridviewctrl.DataBind();

Paging
Note: This needs AllowPaging to be set to “true”. The following code goes in the “PageIndexChanging” callback.

gridviewctrl.PageIndex = e.NewPageIndex;
gridviewctrl.DataSource = Session["data"];
gridviewctrl.DataBind();

Sorting
Note: This needs AllowSorting to be set to “true” and ensure all columns you want sorted have a “SortExpression” that matches the column name in the DataTable. The following code goes in the “Sorting” callback.

string dir;
if (e.SortDirection == SortDirection.Ascending) {
    dir = "ASC";
} else {
    dir = "DESC";
}
((DataView)Session["Data"]).Sort = e.SortExpression + " " + dir;
gridviewctrl.DataSource = Session["data"];
gridviewctrl.DataBind();

<asp:ButtonField>s
Create a <asp:ButtonField> declaration as follows: <asp:ButtonField ButtonType=”Button” Text=”Button Text Here” CommandName=”DoSomething” />

if (e.CommandName == "DoSomething") {
    // get Index
    int index = Convert.ToInt32(e.CommandArgument);
    string test = ((DataView)Session["Data"]).Table.Rows[index]["Column1"];
    Response.Redirect("http://www.google.com/search?q=" + test.ToString()");
}

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Topics: HTTP (Internet), Windows | 10 Comments »

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