using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
 
public partial class nextpage : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        SqlConnection con = new SqlConnection("user id=sa;password=vikram;database=MUDIAM_INC");
        SqlCommand cmd = new SqlCommand("select * from mudiamINC", con);
        cmd.Connection = con;
        con.Open();
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        SqlConnection con = new SqlConnection("user id=sa;password=vikram;database=MUDIAM_INC");
        SqlDataAdapter da = new SqlDataAdapter("select * from mudiamINC where fname like" + TextBox1.Text + " %", con);
        DataSet ds = new DataSet();
        da.Fill(ds, "mudiamINC");
        con.Open();
        SqlCommand cmd = new SqlCommand();
        cmd.Connection = con;
        cmd.CommandText = "select * from mudiamINC";
 
    }
}

An expression of non-boolean type specified in a context where a condition is expected, near 'likekrani'

SqlDataAdapter da = new SqlDataAdapter("select * from mudiamINC where fname like" + TextBox1.Text + " %", con);

SqlDataAdapter da = new SqlDataAdapter("select * from mudiamINC where fname like " + TextBox1.Text + "%", con);