Disable ASP.Net TextBox OnRowEditing event inside Gridview using C# and VB.Net

Hi Vincenzo67,

Please refer below sample.

HTML

<asp:GridView ID="gvCustomers" runat="server" AutoGenerateColumns="false"
    OnRowEditing="gvCustomers_RowEditing" OnRowDataBound="gvCustomers_RowDataBound">
    <Columns>
        <asp:BoundField DataField="Id" HeaderText="Id" ReadOnly="true" />
        <asp:TemplateField HeaderText="Country">
            <ItemTemplate>
                <asp:TextBox ID="txtCountry1" runat="server" TextMode="SingleLine"
                    Text='<%# Eval("Country") %>'></asp:TextBox>
            </ItemTemplate>
            <EditItemTemplate>
                <asp:TextBox ID="txtCountry2" runat="server" TextMode="SingleLine"
                    Text='<%# Eval("Country") %>'></asp:TextBox>
            </EditItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField>
            <ItemTemplate>
                <asp:LinkButton ID="lnkEdit" Text="Edit" runat="server" CommandName="Edit" />
            </ItemTemplate>
            <EditItemTemplate>
                <asp:LinkButton Text="Update" runat="server" OnClick="OnUpdate" />
                <asp:LinkButton Text="Cancel" runat="server" OnClick="OnCancel" />
            </EditItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

Namespace

C#

using System.Data;

VB

Imports System.Data

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        this.BindGrid();
    }
}

private void BindGrid()
{
    DataTable dt = new DataTable();
    dt.Columns.AddRange(new DataColumn[2] { new DataColumn("Id"), new DataColumn("Country") });
    dt.Rows.Add(1, "India");
    dt.Rows.Add(2, "USA");
    dt.Rows.Add(3, "Nepal");
    gvCustomers.DataSource = dt;
    gvCustomers.DataBind();
}

protected void OnUpdate(object sender, EventArgs e)
{
}

protected void OnCancel(object sender, EventArgs e)
{
}

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

protected void gvCustomers_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow && e.Row.RowState == DataControlRowState.Edit)
    {
        TextBox tb = e.Row.FindControl("txtCountry2") as TextBox;
        tb.Text = string.Empty;
        tb.Enabled = false;
    }
}

VB

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not Me.IsPostBack Then
        Me.BindGrid()
    End If
End Sub

Private Sub BindGrid()
    Dim dt As DataTable = New DataTable()
    dt.Columns.AddRange(New DataColumn(1) {New DataColumn("Id"), New DataColumn("Country")})
    dt.Rows.Add(1, "India")
    dt.Rows.Add(2, "USA")
    dt.Rows.Add(3, "Nepal")
    gvCustomers.DataSource = dt
    gvCustomers.DataBind()
End Sub

Protected Sub OnUpdate(ByVal sender As Object, ByVal e As EventArgs)
End Sub

Protected Sub OnCancel(ByVal sender As Object, ByVal e As EventArgs)
End Sub

Protected Sub gvCustomers_RowEditing(ByVal sender As Object, ByVal e As GridViewEditEventArgs)
    gvCustomers.EditIndex = e.NewEditIndex
    Me.BindGrid()
End Sub

Protected Sub gvCustomers_RowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs)
    If e.Row.RowType = DataControlRowType.DataRow AndAlso e.Row.RowState = DataControlRowState.Edit Then
        Dim tb As TextBox = TryCast(e.Row.FindControl("txtCountry2"), TextBox)
        tb.Text = String.Empty
        tb.Enabled = False
    End If
End Sub

Screenshot