Enable TextBox on GridView row edit Button Click using C# and VB.net in ASP.Net

Hi akhter,

You have to use GridView RowDataBound event.

Check the below sample.

HTML

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" OnRowEditing="OnRowEditing" OnRowDataBound="OnRowDataBound">
    <Columns>
        <asp:BoundField DataField="Name" HeaderText="Name"></asp:BoundField>
        <asp:TemplateField HeaderText="Country">
            <ItemTemplate>
                <asp:Label ID="lblCountry" runat="server" Text='<%# Bind("Country") %>'></asp:Label>
            </ItemTemplate>
            <EditItemTemplate>
                <asp:TextBox ID="txtCountry" runat="server" Text='<%# Bind("Country") %>' Enabled="false"></asp:TextBox>
            </EditItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField>
            <ItemTemplate>
                <asp:LinkButton runat="server" CommandName="Edit" Text="Edit" />
            </ItemTemplate>
            <EditItemTemplate>
                <asp:LinkButton runat="server" OnClick="OnUpdate" Text="Update" />
                <asp:LinkButton runat="server" OnClick="OnCancel" Text="Cancel" />
            </EditItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

Namespaces

C#

using System.Data;

VB.Net

Imports System.Data

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        DataTable dt = new DataTable();
        dt.Columns.AddRange(new DataColumn[3] { new DataColumn("Id"), new DataColumn("Name"), new DataColumn("Country") });
        dt.Rows.Add(1, "John Hammond", "United States");
        dt.Rows.Add(2, "Mudassar Khan", "India");
        dt.Rows.Add(3, "Suzanne Mathews", "France");
        dt.Rows.Add(4, "Robert Schidner", "Russia");
        ViewState["dt"] = dt;
        this.BindGrid();
    }
}

protected void OnRowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow && e.Row.RowState == DataControlRowState.Edit)
    {
        TextBox txtCountry = e.Row.FindControl("txtCountry") as TextBox;
        txtCountry.Enabled = true;
    }
}

protected void OnRowEditing(object sender, GridViewEditEventArgs e)
{
    GridView1.EditIndex = e.NewEditIndex;
    this.BindGrid();
}

protected void OnUpdate(object sender, EventArgs e)
{
    GridViewRow row = (sender as LinkButton).NamingContainer as GridViewRow;
    string name = (row.Cells[0].Controls[0] as TextBox).Text;
    string country = (row.Cells[1].Controls[0] as TextBox).Text;
    DataTable dt = ViewState["dt"] as DataTable;
    dt.Rows[row.RowIndex]["Name"] = name;
    dt.Rows[row.RowIndex]["Country"] = country;
    ViewState["dt"] = dt;
    GridView1.EditIndex = -1;
    this.BindGrid();
}

protected void OnCancel(object sender, EventArgs e)
{
    GridView1.EditIndex = -1;
    this.BindGrid();
}

protected void BindGrid()
{
    GridView1.DataSource = ViewState["dt"] as DataTable;
    GridView1.DataBind();
}

VB.Net

Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
    If Not Me.IsPostBack Then
        Dim dt As New DataTable()
        dt.Columns.AddRange(New DataColumn(2) {New DataColumn("Id"), New DataColumn("Name"), New DataColumn("Country")})
        dt.Rows.Add(1, "John Hammond", "United States")
        dt.Rows.Add(2, "Mudassar Khan", "India")
        dt.Rows.Add(3, "Suzanne Mathews", "France")
        dt.Rows.Add(4, "Robert Schidner", "Russia")
        ViewState("dt") = dt
        Me.BindGrid()
    End If
End Sub

Protected Sub OnRowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs)
    If e.Row.RowType = DataControlRowType.DataRow AndAlso e.Row.RowState = DataControlRowState.Edit Then
        Dim txtCountry As TextBox = TryCast(e.Row.FindControl("txtCountry"), TextBox)
        txtCountry.Enabled = True
    End If
End Sub

Protected Sub OnRowEditing(sender As Object, e As GridViewEditEventArgs)
    GridView1.EditIndex = e.NewEditIndex
    Me.BindGrid()
End Sub

Protected Sub OnUpdate(sender As Object, e As EventArgs)
    Dim row As GridViewRow = TryCast(TryCast(sender, LinkButton).NamingContainer, GridViewRow)
    Dim name As String = TryCast(row.Cells(0).Controls(0), TextBox).Text
    Dim country As String = TryCast(row.Cells(1).Controls(0), TextBox).Text
    Dim dt As DataTable = TryCast(ViewState("dt"), DataTable)
    dt.Rows(row.RowIndex)("Name") = name
    dt.Rows(row.RowIndex)("Country") = country
    ViewState("dt") = dt
    GridView1.EditIndex = -1
    Me.BindGrid()
End Sub

Protected Sub OnCancel(sender As Object, e As EventArgs)
    GridView1.EditIndex = -1
    Me.BindGrid()
End Sub

Protected Sub BindGrid()
    GridView1.DataSource = TryCast(ViewState("dt"), DataTable)
    GridView1.DataBind()
End Sub

Screenshot