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所以我目前正在尝试一个带有图像的文本框,并且我有方法 onclick 在 c# 中输入我的 button_clink 事件,但它不起作用

<div class="input-container">
    <input type="text" id="txtSearch" runat="server" class="input-field" style="color: black;" placeholder="Pesquisar.."/>
    <button id="btnsearch" class="wrapper" OnClick="btnsearch_Click" runat="server"><i class="fas fa-search" style="color:#8b9095;" ></i></button>
</div>

c#代码:

protected void btnsearch_Click(object sender, EventArgs e)
{
    con.Open();
    var txtSearch = FindControl("txtSearch") as TextBox;
    SqlCommand cmd = new SqlCommand("select DISTINCT from [encomenda] where No_= " + txtSearch + "", con);

    SqlDataReader sdr = cmd.ExecuteReader();

    if (sdr.Read())
    {
        SqlDataAdapter sda = new SqlDataAdapter(cmd);
        DataTable dt = new DataTable();
        sda.Fill(dt);
        GridView1.DataSource = dt;
        GridView1.DataBind();
    }

    con.Close();
}
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