How to filter Gridview on Textbox text Changing value using Ajax

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C#

C#4.0

friends I want to sort or filter the gridview on textbox text changing value using Ajax in Asp.net

Posted 21-Mar-12 23:55pm

Ajay Kumar Tiwari From Mumbai

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seliya hilal · Answer 1 · 2012-03-22T00:05:00

Solution 2

for sorting, sort source data table. which is more helpful

Eg..

protected void gridView_Sorting(object sender, GridViewSortEventArgs e)
{
DataTable dataTable = gridView.DataSource as DataTable;

if (dataTable != null)
{
DataView dataView = new DataView(dataTable);
dataView.Sort = e.SortExpression + " " + ConvertSortDirectionToSql(e.SortDirection);

gridView.DataSource = dataView;
gridView.DataBind();
}
}

Posted 22-Mar-12 0:05am

seliya hilal

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seliya hilal 22-Mar-12 6:08am

===============
The code below works when columns are created explicitly as declerative >><asp:BoundField DataField="ID" HeaderText="ID" SortExpression="" />
===============

AllowSorting

="True"
OnSorting

="GvEvent_Sorting"

<

asp:TemplateField ItemStyle-HorizontalAlign="Right" HeaderText="MyDate" SortExpression

="MyDate">

#region GV_sort event and Sort Direction

protected void GvEvent_Sorting(object sender, GridViewSortEventArgs e)
{

//Retrieve the table from the session object.
DataTable dt = Session["MyDS"] as DataTable;
if (dt != null)
{
//Sort the data.
dt.DefaultView.Sort = e.SortExpression + " " + GetSortDirection(e.SortExpression);
GridView Gv = (GridView)sender;
Gv.DataSource = Session["MyDS"];
Gv.DataBind();
}
}

private string GetSortDirection(string column)
{
// By default, set the sort direction to ascending.
string sortDirection = "ASC";
// Retrieve the last column that was sorted.
string sortExpression = ViewState["SortExpression"] as string;
if (sortExpression != null)
{
// Check if the same column is being sorted.
// Otherwise, the default value can be returned.
if (sortExpression == column)
{
string lastDirection = ViewState["SortDirection"] as string;
if ((lastDirection != null) && (lastDirection == "ASC"))
{
sortDirection = "DESC";
}
}
}
// Save new values in ViewState.
ViewState["SortDirection"] = sortDirection;
ViewState["SortExpression"] = column;
return sortDirection;
}
#endregion

seliya hilal 22-Mar-12 6:15am

For filtering filter using session which will hold value after postback

You have to write textbox value in session

write code where you using sql expression..

Eg..

String sql="Select * From Table_Name ";

If(!String.IsNullOrEmpty(txtFirstname.text))
{
sql+= txtFirstname.text;
}