Filter ASP.Net GridView with DropDownList and TextBox using C# and VB.Net

Hi akhter,

Refer below sample.

SQL

CREATE PROCEDURE SearchNameCounry
	@Name VARCHAR(50)= NULL,
	@Country VARCHAR(50) = NULL
AS
BEGIN
	SELECT TOP 5 CompanyName
		   ,ContactName
		   ,Country
	FROM Customers
	WHERE (ContactName = @Name OR @Name IS NULL) OR (Country = @Country OR @Country IS NULL)
END

HTML

Name :
<asp:TextBox runat="server" ID="txtName" AutoPostBack="true" OnTextChanged="SearchByName" />
<br />
<br />
Country :
<asp:DropDownList runat="server" ID="ddlCountry" AutoPostBack="true" OnSelectedIndexChanged="SearchByCountry">
</asp:DropDownList>
<br />
<br />
<asp:GridView runat="server" AutoGenerateColumns="false" ID="gvCustomers">
    <Columns>
        <asp:BoundField DataField="CompanyName" HeaderText="CompanyName" />
        <asp:BoundField DataField="ContactName" HeaderText="ContactName" />
        <asp:BoundField DataField="Country" HeaderText="Country" />
    </Columns>
</asp:GridView>

Namespaces

C#

using System.Data;
using System.Data.SqlClient;
using System.Configuration;

VB.Net

Imports System.Data.SqlClient
Imports System.Data

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
        using (SqlConnection con = new SqlConnection(constr))
        {
            using (SqlCommand cmd = new SqlCommand("SELECT Country FROM Customers", con))
            {
                SqlDataAdapter da = new SqlDataAdapter(cmd);
                DataTable dt = new DataTable();
                da.Fill(dt);
                ddlCountry.DataSource = dt;
                ddlCountry.DataTextField = "Country";
                ddlCountry.DataValueField = "Country";
                ddlCountry.DataBind();
                ddlCountry.Items.Insert(0, new ListItem("Please select"));
            }
        }

        DataTable dt1 = GetData(txtName.Text, ddlCountry.SelectedValue);
        gvCustomers.DataSource = dt1;
        gvCustomers.DataBind();
    }
}

protected void SearchByName(object sender, EventArgs e)
{
    DataTable dt = GetData(txtName.Text, ddlCountry.SelectedValue);
    gvCustomers.DataSource = dt;
    gvCustomers.DataBind();
}

protected void SearchByCountry(object sender, EventArgs e)
{
    DataTable dt = GetData(txtName.Text, ddlCountry.SelectedValue);
    gvCustomers.DataSource = dt;
    gvCustomers.DataBind();
}

private DataTable GetData(string name, string country)
{
    string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    using (SqlConnection con = new SqlConnection(constr))
    {
        using (SqlCommand cmd = new SqlCommand("SearchNameCounry", con))
        {
            cmd.CommandType = CommandType.StoredProcedure;
            if (!string.IsNullOrEmpty(name))
            {
                cmd.Parameters.AddWithValue("@Name", name);
            }
            else
            {
                cmd.Parameters.AddWithValue("@Name", "");
            }

            if (!string.IsNullOrEmpty(country))
            {
                cmd.Parameters.AddWithValue("@Country", country);
            }
            else
            {
                cmd.Parameters.AddWithValue("@Country", "");
            }

            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataTable dt = new DataTable();
            da.Fill(dt);
            return dt;
        }
    }
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not Me.IsPostBack Then
        Dim constr As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
        Using con As SqlConnection = New SqlConnection(constr)
            Using cmd As SqlCommand = New SqlCommand("SELECT Country FROM Customers", con)
                Dim da As SqlDataAdapter = New SqlDataAdapter(cmd)
                Dim dt As DataTable = New DataTable()
                da.Fill(dt)
                ddlCountry.DataSource = dt
                ddlCountry.DataTextField = "Country"
                ddlCountry.DataValueField = "Country"
                ddlCountry.DataBind()
                ddlCountry.Items.Insert(0, New ListItem("Please select"))
            End Using
        End Using

        Dim dt1 As DataTable = GetData(txtName.Text, ddlCountry.SelectedValue)
        gvCustomers.DataSource = dt1
        gvCustomers.DataBind()
    End If
End Sub

Protected Sub SearchByName(ByVal sender As Object, ByVal e As EventArgs)
    Dim dt As DataTable = GetData(txtName.Text, ddlCountry.SelectedValue)
    gvCustomers.DataSource = dt
    gvCustomers.DataBind()
End Sub

Protected Sub SearchByCountry(ByVal sender As Object, ByVal e As EventArgs)
    Dim dt As DataTable = GetData(txtName.Text, ddlCountry.SelectedValue)
    gvCustomers.DataSource = dt
    gvCustomers.DataBind()
End Sub

Private Function GetData(ByVal name As String, ByVal country As String) As DataTable
    Dim constr As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
    Using con As SqlConnection = New SqlConnection(constr)
        Using cmd As SqlCommand = New SqlCommand("SearchNameCounry", con)
            cmd.CommandType = CommandType.StoredProcedure
            If Not String.IsNullOrEmpty(name) Then
                cmd.Parameters.AddWithValue("@Name", name)
            Else
                cmd.Parameters.AddWithValue("@Name", "")
            End If

            If Not String.IsNullOrEmpty(country) Then
                cmd.Parameters.AddWithValue("@Country", country)
            Else
                cmd.Parameters.AddWithValue("@Country", "")
            End If

            Dim da As SqlDataAdapter = New SqlDataAdapter(cmd)
            Dim dt As DataTable = New DataTable()
            da.Fill(dt)
            Return dt
        End Using
    End Using
End Function

Screenshot