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DataGrid Update

using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; using System.Data.SqlClient;     public class Form1 : System.Windows.Forms.Form {       private System.Windows.Forms.DataGrid dataGrid1;       private System.Windows.Forms.Button buttonUpdate;       private System.Data.DataSet dataSet1;       private System.Data.SqlClient.SqlCommand sqlCommand1;       private System.ComponentModel.Container components = null;       private SqlCommandBuilder cb;       private SqlDataAdapter da;       public Form1() {          InitializeComponent();       }       private void InitializeComponent(){          this.dataGrid1 = new System.Windows.Forms.DataGrid();          this.buttonUpdate = new System.Windows.Forms.Button();          this.dataSet1 = new System.Data.DataSet();          this.sqlCommand1 = new System.Data.SqlClient.SqlCommand();          ((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).BeginInit();          ((System.ComponentModel.ISupportInitialize)(this.dataSet1)).BeginInit();          this.SuspendLayout();          this.dataGrid1.DataMember = "";          this.dataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText;          this.dataGrid1.Location = new System.Drawing.Point(8, 8);          this.dataGrid1.Name = "dataGrid1";          this.dataGrid1.Size = new System.Drawing.Size(440, 208);          this.dataGrid1.TabIndex = 0;          this.buttonUpdate.Location = new System.Drawing.Point(191, 232);          this.buttonUpdate.Name = "buttonUpdate";          this.buttonUpdate.TabIndex = 1;          this.buttonUpdate.Text = "Update";          this.buttonUpdate.Click += new System.EventHandler(this.buttonUpdate_Click);          this.dataSet1.DataSetName = "NewDataSet";          this.dataSet1.Locale = new System.Globalization.CultureInfo("en-US");          this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);          this.ClientSize = new System.Drawing.Size(456, 272);          this.Controls.Add(this.buttonUpdate);          this.Controls.Add(this.dataGrid1);          this.Name = "Form1";          this.Text = "Form1";          this.Load += new System.EventHandler(this.Form1_Load);          ((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).EndInit();          ((System.ComponentModel.ISupportInitialize)(this.dataSet1)).EndInit();          this.ResumeLayout(false);       }       static void Main() {          Application.Run(new Form1());       }       private void Form1_Load(object sender, System.EventArgs e){          string connString = "server=(local)\\SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI";          string sql = @"select * from employee ";          SqlConnection conn = new SqlConnection(connString);          sqlCommand1 = new SqlCommand(sql, conn);          da = new SqlDataAdapter();          da.SelectCommand = sqlCommand1;          cb = new SqlCommandBuilder(da);          da.Fill(dataSet1, "employee");          dataGrid1.SetDataBinding(dataSet1, "employee");       }       private void buttonUpdate_Click(object sender, System.EventArgs e) {          da.Update(dataSet1, "employee");        }     }